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 Table 2 The average Group Number (GN) for each year 16102015. The
 estimated relative ± error in % is used to indicate expected low and high
 limits of the Group number. The table is also available in electronic form in
 the Supplemental Material at www.leif.org/research/ .

   From: Reconstruction of the Sunspot Group Number: The Backbone Method
   
    Year  Low GN Mean GN High GN Error %  Year  Low GN Mean GN High GN Error %
  
   1610.5 1.72   2.64    3.56    35      
   1611.5 3.43   5.28    7.13    35      
   1612.5 6.86   10.56   14.26   35      
   1613.5 5.15   7.92    10.69   35      
   1614.5 4.58   7.04    9.50    35      
   1615.5 5.72   8.80    11.88   35      
   1616.5 4.58   7.04    9.50    35      
   1617.5 0.57   0.88    1.19    35      
   1618.5 0.57   0.88    1.19    35      
   1619.5 0.57   0.88    1.19    35      
   1620.5 0.57   0.88    1.19    35      
   1621.5 0.57   0.88    1.19    35      
   1622.5 0.57   0.88    1.19    35      
   1623.5 0.57   0.88    1.19    35      
   1624.5 1.14   1.76    2.38    35      
   1625.5 5.72   8.80    11.88   35      
   1626.5 4.00   6.16    8.32    35      
   1627.5 1.72   2.64    3.56    35      
   1628.5 1.72   2.64    3.56    35      
   1629.5 1.72   2.64    3.56    35      
   1630.5 0.03   0.05    0.08    50      
   1631.5 0.57   0.88    1.19    35      
   1632.5 0.03   0.05    0.08    50      
   1633.5 2.29   3.52    4.75    35      
   1634.5 1.72   2.64    3.56    35      
   1635.5 1.14   1.76    2.38    35      
   1636.5 1.11   1.70    2.30    35      
   1637.5 1.17   1.80    2.43    35      
   1638.5 1.14   1.76    2.38    35      
   1639.5 0.57   0.88    1.19    35      
   1640.5 0.57   0.88    1.19    35      
   1641.5 1.04   1.60    2.16    35      
   1642.5 1.72   2.64    3.56    35      
   1643.5 2.29   3.52    4.75    35      
   1644.5 2.86   4.40    5.94    35      
   1645.5 0.57   0.88    1.19    35      
   1646.5 0.26   0.40    0.54    35      
   1647.5 0.13   0.20    0.27    35      
   1648.5 0.03   0.05    0.08    50      
   1649.5 0.03   0.05    0.08    50      
   1650.5 0.20   0.30    0.41    35      
   1651.5 0.65   1.00    1.35    35      
   1652.5 1.14   1.76    2.38    35      
   1653.5 1.72   2.64    3.56    35      
   1654.5 2.29   3.52    4.75    35      
   1655.5 0.57   0.88    1.19    35      
   1656.5 0.57   0.88    1.19    35      
   1657.5 0.57   0.88    1.19    35      
   1658.5 0.03   0.05    0.08    50      
   1659.5 0.03   0.05    0.08    50      
   1660.5 1.14   1.76    2.38    35      
   1661.5 0.57   0.88    1.19    35      
   1662.5 0.03   0.05    0.08    50      
   1663.5 0.03   0.05    0.08    50      
   1664.5 0.03   0.05    0.08    50      
   1665.5 0.03   0.05    0.08    50      
   1666.5 0.03   0.05    0.08    50      
   1667.5 0.03   0.05    0.08    50      
   1668.5 0.03   0.05    0.08    50      
   1669.5 0.03   0.05    0.08    50      
   1670.5 0.03   0.05    0.08    50      
   1671.5 0.57   0.88    1.19    35      
   1672.5 0.57   0.88    1.19    35      
   1673.5 0.03   0.05    0.08    50      
   1674.5 0.57   0.88    1.19    35      
   1675.5 0.03   0.05    0.08    50      
   1676.5 1.14   1.76    2.38    35      
   1677.5 0.57   0.88    1.19    35      
   1678.5 0.57   0.88    1.19    35      
   1679.5 0.57   0.88    1.19    35      
   1680.5 1.14   1.76    2.38    35      
   1681.5 0.57   0.88    1.19    35      
   1682.5 0.57   0.88    1.19    35      
   1683.5 0.03   0.05    0.08    50      
   1684.5 1.14   1.76    2.38    35      
   1685.5 0.03   0.05    0.08    50      
   1686.5 1.72   2.64    3.56    35      
   1687.5 1.14   1.76    2.38    35      
   1688.5 1.14   1.76    2.38    35      
   1689.5 0.57   0.88    1.19    35      
   1690.5 0.03   0.05    0.08    50      
   1691.5 0.03   0.05    0.08    50      
   1692.5 0.03   0.05    0.08    50      
   1693.5 0.03   0.05    0.08    50      
   1694.5 0.03   0.05    0.08    50      
   1695.5 0.57   0.88    1.19    35      
   1696.5 0.03   0.05    0.08    50      
   1697.5 0.03   0.05    0.08    50      
   1698.5 0.03   0.05    0.08    50      
   1699.5 0.03   0.05    0.08    50      
   1700.5 1.45   1.76    2.07    18      
   1701.5 1.45   1.76    2.07    18      
   1702.5 0.73   0.88    1.03    18      
   1703.5 2.18   2.64    3.10    18      
   1704.5 3.63   4.40    5.17    18      
   1705.5 4.36   5.28    6.20    18      
   1706.5 2.90   3.52    4.14    18      
   1707.5 2.18   2.64    3.10    18      
   1708.5 1.45   1.76    2.07    18      
   1709.5 2.18   2.64    3.10    18      
   1710.5 0.73   0.88    1.03    18      
   1711.5 0.04   0.05    0.06    20      
   1712.5 0.04   0.05    0.06    20      
   1713.5 0.73   0.88    1.03    18      
   1714.5 1.45   1.76    2.07    18      
   1715.5 2.90   3.52    4.14    18      
   1716.5 5.81   7.04    8.27    18      
   1717.5 3.63   4.40    5.17    18      
   1718.5 3.63   4.40    5.17    18      
   1719.5 5.08   6.16    7.24    18      
   1720.5 6.53   7.92    9.31    18      
   1721.5 6.53   7.92    9.31    18      
   1722.5 1.45   1.76    2.07    18      
   1723.5 0.73   0.88    1.03    18      
   1724.5 2.18   2.64    3.10    18      
   1725.5 2.18   2.64    3.10    18      
   1726.5 7.26   8.80    10.34   18      
   1727.5 5.81   7.04    8.27    18      
   1728.5 9.44   11.44   13.44   18      
   1729.5 6.53   7.92    9.31    18      
   1730.5 7.26   8.80    10.34   18      
   1731.5 5.03   6.10    7.17    18      
   1732.5 2.18   2.64    3.10    18      
   1733.5 0.73   0.88    1.03    18      
   1734.5 0.91   1.10    1.29    18      
   1735.5 2.90   3.52    4.14    18      
   1736.5 6.53   7.92    9.31    18      
   1737.5 2.18   2.64    3.10    18      
   1738.5 2.90   3.52    4.14    18      
   1739.5 6.41   7.77    9.13    17      
   1740.5 4.79   5.80    6.82    18      
   1741.5 2.18   2.64    3.10    18      
   1742.5 2.29   2.78    3.27    17      
   1743.5 1.49   1.81    2.12    17      
   1744.5 2.34   2.84    3.33    17      
   1745.5 4.14   5.02    5.90    18      
   1746.5 6.17   7.48    8.78    17      
   1747.5 7.70   9.33    10.97   18      
   1748.5 8.03   9.74    11.44   17      
   1749.5 6.58   7.97    9.37    18      
   1750.5 7.27   8.82    10.36   17      
   1751.5 3.99   4.84    5.68    17      
   1752.5 3.40   4.13    4.85    17      
   1753.5 2.31   2.80    3.29    17      
   1754.5 1.07   1.30    1.52    17      
   1755.5 0.70   0.85    1.00    17      
   1756.5 1.05   1.27    1.49    17      
   1757.5 3.00   3.63    4.27    18      
   1758.5 3.49   4.23    4.97    18      
   1759.5 4.19   5.07    5.96    18      
   1760.5 4.28   5.19    6.10    18      
   1761.5 6.85   8.30    9.75    18      
   1762.5 4.98   6.04    7.10    18      
   1763.5 3.44   4.17    4.90    17      
   1764.5 4.24   5.14    6.04    18      
   1765.5 1.12   1.36    1.59    17      
   1766.5 1.06   1.29    1.51    17      
   1767.5 3.83   4.65    5.46    17      
   1768.5 6.52   7.90    9.29    18      
   1769.5 8.79   10.65   12.52   18      
   1770.5 8.07   9.78    11.49   17      
   1771.5 7.10   8.60    10.11   18      
   1772.5 5.52   6.69    7.86    17      
   1773.5 2.89   3.50    4.11    18      
   1774.5 3.18   3.86    4.54    18      
   1775.5 1.66   2.01    2.36    17      
   1776.5 2.09   2.53    2.97    18      
   1777.5 6.14   7.44    8.74    18      
   1778.5 9.92   12.03   14.13   17      
   1779.5 8.90   10.78   12.67   18      
   1780.5 7.27   8.81    10.35   17      
   1781.5 6.94   8.41    9.88    17      
   1782.5 2.71   3.29    3.86    17      
   1783.5 2.44   2.95    3.47    18      
   1784.5 0.44   0.53    0.62    17      
   1785.5 1.43   1.73    2.04    18      
   1786.5 6.90   8.36    9.83    18      
   1787.5 9.77   11.84   13.91   18      
   1788.5 9.20   11.15   13.10   17      
   1789.5 8.02   9.72    11.43   18      
   1790.5 6.61   8.01    9.42    18      
   1791.5 5.51   6.68    7.85    18      
   1792.5 4.95   6.01    7.06    17      
   1793.5 1.98   2.40    2.82    18      
   1794.5 3.46   4.19    4.93    18      
   1795.5 1.42   1.73    2.03    17      
   1796.5 1.19   1.45    1.70    17      
   1797.5 0.59   0.71    0.84    18      
   1798.5 0.36   0.43    0.51    18      
   1799.5 0.54   0.66    0.78    18      
   1800.5 1.65   2.00    2.35    18      
   1801.5 3.92   4.74    5.55    17      
   1802.5 3.20   3.84    4.47    17      
   1803.5 3.37   4.01    4.65    16      
   1804.5 4.20   4.96    5.73    15      
   1805.5 3.30   3.88    4.46    15      
   1806.5 1.57   1.83    2.09    14      
   1807.5 1.51   1.75    2.00    14      
   1808.5 0.93   1.07    1.22    13      
   1809.5 0.49   0.57    0.64    13      
   1810.5 0.04   0.05    0.06    20      
   1811.5 0.28   0.32    0.36    12      
   1812.5 1.47   1.67    1.87    12      
   1813.5 2.19   2.48    2.77    12
   1814.5 1.91   2.15    2.39    11
   1815.5 2.33   2.61    2.90    11
   1816.5 3.14   3.51    3.88    11
   1817.5 2.87   3.20    3.53    10
   1818.5 3.43   3.81    4.19    10
   1819.5 3.39   3.75    4.12    10
   1820.5 1.59   1.75    1.92    9
   1821.5 1.64   1.80    1.97    9
   1822.5 1.74   1.91    2.08    9
   1823.5 0.83   0.91    0.99    9
   1824.5 1.24   1.35    1.46    8
   1825.5 2.19   2.39    2.59    8
   1826.5 3.53   3.84    4.15    8
   1827.5 4.49   4.87    5.25    8
   1828.5 5.24   5.67    6.10    8
   1829.5 5.90   6.38    6.86    7
   1830.5 5.88   6.35    6.82    7
   1831.5 4.22   4.55    4.88    7
   1832.5 2.59   2.79    2.99    7
   1833.5 0.97   1.04    1.11    7
   1834.5 1.38   1.48    1.58    7
   1835.5 4.59   4.91    5.23    7
   1836.5 8.99   9.61    10.23   6
   1837.5 10.60  11.32   12.04   6
   1838.5 7.74   8.26    8.78    6
   1839.5 6.58   7.01    7.44    6
   1840.5 4.94   5.26    5.58    6
   1841.5 2.62   2.78    2.94    6
   1842.5 1.81   1.92    2.03    6
   1843.5 0.71   0.75    0.79    6
   1844.5 1.05   1.11    1.17    6
   1845.5 2.97   3.14    3.31    6
   1846.5 4.35   4.60    4.85    5
   1847.5 6.69   7.07    7.45    5
   1848.5 9.07   9.58    10.09   5
   1849.5 8.45   8.92    9.39    5
   1850.5 6.07   6.40    6.73    5
   1851.5 6.12   6.45    6.78    5
   1852.5 5.24   5.52    5.80    5
   1853.5 3.94   4.15    4.36    5
   1854.5 1.89   1.99    2.09    5
   1855.5 0.73   0.77    0.81    5
   1856.5 0.46   0.48    0.50    5
   1857.5 2.52   2.65    2.78    5
   1858.5 5.01   5.26    5.51    5
   1859.5 8.46   8.88    9.30    5
   1860.5 9.48   9.94    10.40   5
   1861.5 7.73   8.10    8.47    5
   1862.5 5.50   5.76    6.02    5
   1863.5 4.73   4.96    5.19    5
   1864.5 4.18   4.38    4.58    5
   1865.5 2.55   2.67    2.79    4
   1866.5 1.68   1.76    1.84    4
   1867.5 0.78   0.82    0.86    4
   1868.5 3.30   3.45    3.60    4
   1869.5 6.75   7.06    7.37    4
   1870.5 10.73  11.22   11.71   4
   1871.5 9.81   10.25   10.69   4
   1872.5 8.31   8.68    9.05    4
   1873.5 5.74   5.99    6.24    4
   1874.5 3.82   3.99    4.16    4
   1875.5 1.75   1.83    1.91    4
   1876.5 1.13   1.18    1.23    4
   1877.5 0.95   0.99    1.03    4
   1878.5 0.40   0.42    0.44    4
   1879.5 0.73   0.76    0.79    4
   1880.5 2.59   2.70    2.81    4
   1881.5 4.43   4.62    4.81    4
   1882.5 4.58   4.78    4.98    4
   1883.5 5.09   5.31    5.53    4
   1884.5 5.60   5.84    6.08    4
   1885.5 4.45   4.64    4.83    4
   1886.5 2.31   2.41    2.51    4
   1887.5 1.30   1.35    1.40    4
   1888.5 0.75   0.78    0.81    4
   1889.5 0.58   0.60    0.62    4
   1890.5 0.66   0.69    0.72    4
   1891.5 3.42   3.56    3.70    4
   1892.5 5.94   6.18    6.42    4
   1893.5 7.42   7.73    8.04    4
   1894.5 6.83   7.11    7.39    4
   1895.5 5.27   5.49    5.71    4
   1896.5 3.30   3.44    3.58    4
   1897.5 2.51   2.61    2.71    4
   1898.5 2.09   2.17    2.25    4
   1899.5 1.05   1.09    1.13    4
   1900.5 0.84   0.87    0.90    4
   1901.5 0.26   0.27    0.28    4
   1902.5 0.33   0.34    0.35    4
   1903.5 1.77   1.84    1.91    4
   1904.5 3.61   3.76    3.91    4
   1905.5 4.35   4.52    4.69    4
   1906.5 4.32   4.49    4.66    4
   1907.5 4.57   4.75    4.93    4
   1908.5 3.94   4.10    4.26    4
   1909.5 3.36   3.49    3.62    4
   1910.5 1.64   1.71    1.78    4
   1911.5 0.63   0.66    0.69    4
   1912.5 0.30   0.31    0.32    4
   1913.5 0.13   0.13    0.13    4
   1914.5 0.89   0.93    0.97    4
   1915.5 3.37   3.50    3.63    4
   1916.5 4.64   4.82    5.00    4
   1917.5 7.60   7.90    8.20    4
   1918.5 6.31   6.56    6.81    4
   1919.5 5.24   5.45    5.66    4
   1920.5 3.14   3.26    3.38    4
   1921.5 2.12   2.20    2.28    4
   1922.5 1.20   1.25    1.30    4
   1923.5 0.56   0.58    0.60    4
   1924.5 1.32   1.37    1.42    4
   1925.5 3.70   3.85    4.00    4
   1926.5 5.07   5.27    5.47    4
   1927.5 5.72   5.95    6.18    4
   1928.5 5.82   6.05    6.28    4
   1929.5 5.19   5.39    5.59    4
   1930.5 3.18   3.31    3.44    4
   1931.5 1.96   2.04    2.12    4
   1932.5 1.09   1.13    1.17    4
   1933.5 0.54   0.56    0.58    4
   1934.5 0.84   0.87    0.90    4
   1935.5 3.18   3.31    3.44    4
   1936.5 6.53   6.79    7.05    4
   1937.5 9.02   9.37    9.72    4
   1938.5 8.32   8.65    8.98    4
   1939.5 7.46   7.75    8.04    4
   1940.5 5.22   5.43    5.63    4
   1941.5 3.56   3.70    3.84    4
   1942.5 2.44   2.53    2.63    4
   1943.5 1.17   1.21    1.26    4
   1944.5 0.80   0.83    0.86    4
   1945.5 2.67   2.78    2.88    4
   1946.5 6.63   6.89    7.15    4
   1947.5 9.75   10.13   10.51   4
   1948.5 8.99   9.35    9.70    4
   1949.5 8.96   9.31    9.66    4
   1950.5 5.41   5.63    5.84    4
   1951.5 4.10   4.26    4.42    4
   1952.5 2.34   2.43    2.52    4
   1953.5 1.09   1.13    1.17    4
   1954.5 0.49   0.50    0.52    4
   1955.5 2.78   2.89    3.00    4
   1956.5 9.00   9.36    9.71    4
   1957.5 11.77  12.23   12.69   4
   1958.5 12.47  12.95   13.44   4
   1959.5 10.46  10.87   11.28   4
   1960.5 7.63   7.93    8.22    4
   1961.5 3.78   3.93    4.07    4
   1962.5 2.45   2.54    2.64    4
   1963.5 1.90   1.97    2.05    4
   1964.5 0.85   0.88    0.91    4
   1965.5 1.16   1.21    1.25    4
   1966.5 3.19   3.32    3.44    4
   1967.5 6.81   7.07    7.34    4
   1968.5 6.87   7.14    7.41    4
   1969.5 7.00   7.27    7.54    4
   1970.5 7.74   8.04    8.34    4
   1971.5 5.28   5.49    5.69    4
   1972.5 5.13   5.33    5.53    4
   1973.5 2.84   2.95    3.06    4
   1974.5 2.59   2.69    2.79    4
   1975.5 1.14   1.19    1.23    4
   1976.5 1.04   1.08    1.12    4
   1977.5 2.22   2.31    2.40    4
   1978.5 7.09   7.36    7.64    4
   1979.5 10.93  11.36   11.78   4
   1980.5 10.11  10.50   10.90   4
   1981.5 9.93   10.32   10.71   4
   1982.5 8.10   8.41    8.73    4
   1983.5 4.83   5.02    5.21    4
   1984.5 3.04   3.16    3.28    4
   1985.5 1.13   1.18    1.22    4
   1986.5 0.83   0.86    0.89    4
   1987.5 1.84   1.92    1.99    4
   1988.5 5.88   6.11    6.34    4
   1989.5 9.70   10.07   10.45   4
   1990.5 9.60   9.97    10.35   4
   1991.5 9.69   10.07   10.44   4
   1992.5 6.59   6.85    7.11    4
   1993.5 3.87   4.02    4.17    4
   1994.5 2.47   2.57    2.67    4
   1995.5 1.43   1.49    1.54    4
   1996.5 0.65   0.67    0.70    4
   1997.5 1.55   1.61    1.67    4
   1998.5 4.70   4.88    5.06    4
   1999.5 6.64   6.90    7.16    4
   2000.5 8.62   8.95    9.29    4
   2001.5 8.85   9.20    9.54    4
   2002.5 8.56   8.90    9.23    4
   2003.5 5.19   5.39    5.59    4
   2004.5 3.39   3.52    3.66    4
   2005.5 2.50   2.60    2.70    4
   2006.5 1.47   1.52    1.58    4
   2007.5 0.76   0.79    0.82    4
   2008.5 0.31   0.32    0.33    4
   2009.5 0.39   0.40    0.42    4
   2010.5 1.61   1.67    1.74    4
   2011.5 4.62   4.80    4.98    4
   2012.5 4.90   5.09    5.28    4
   2013.5 5.56   5.78    5.99    4
   2014.5 6.38   6.63    6.87    4
   2015.5 4.76   4.94    5.13    4