Year Annual 15-yr moving average
1720 130.0
1721 130.0
1722 78.0
1723 220.0
1724 78.0
1725 79.0
1726 360.0
1727 132.0 173.267
1728 220.0 169.933
1729 281.0 176.0
1730 79.0 179.533
1731 279.0 183.933
1732 220.0 193.2
1733 182.0 215.933
1734 131.0 199.6
1735 80.0 197.8
1736 221.0 189.133
1737 131.0 177.667
1738 286.0 193.067
1739 217.0 190.8
1740 420.0 202.8
1741 115.0 210.667
1742 105.0 223.067
1743 90.0 223.333
1744 109.0 233.933
1745 310.0 241.2
1746 245.0 229.467
1747 400.0 243.0
1748 300.0 237.0
1749 317.0 236.0
1750 84.0 254.4
1751 380.0 272.4
1752 240.0 271.8
1753 110.0 276.467
1754 420.0 269.867
1755 330.0 254.533
1756 100.0 242.8
1757 381.0 227.667
1758 360.0 234.067
1759 100.0 224.067
1760 380.0 229.667
1761 146.0 243.667
1762 170.0 221.667
1763 124.0 223.667
1764 90.0 239.0
1765 180.0 236.533
1766 230.0 219.2
1767 324.0 231.933
1768 320.0 225.333
1769 90.0 229.6
1770 360.0 234.267
1771 330.0 239.333
1772 344.0 240.667
1773 100.0 247.933
1774 291.0 248.4
1775 281.0 246.8
1776 210.0 242.133
1777 240.0 261.467
1778 200.0 261.467
1779 110.0 264.8
1780 289.0 260.533
1781 237.0 275.2
1782 300.0 283.8
1783 250.0 269.733
1784 380.0 261.067
1785 360.0 262.4
1786 380.0 255.733
1787 280.0 255.067
1788 320.0 257.8
1789 420.0 252.4
1790 70.0 242.533
1791 80.0 235.333
1792 260.0 238.0
1793 100.0 240.667
1794 100.0 224.4
1795 330.0 220.4
1796 156.0 225.733
1797 152.0 219.067
1798 142.0 241.067
1799 420.0 252.467
1800 400.0 244.467
1801 136.0 256.467
1802 220.0 277.8
1803 400.0 277.133
1804 320.0 281.4
1805 400.0 287.267
1806 251.0 297.8
1807 140.0 296.467
1808 280.0 280.467
1809 420.0 291.4
1810 320.0 282.733
1811 220.0 273.933
1812 240.0 257.933
1813 300.0 255.933
1814 400.0 256.533
1815 160.0 252.267
1816 300.0 245.6
1817 90.0 223.2
1818 268.0 208.267
1819 80.0 204.267
1820 370.0 204.933
1821 260.0 203.667
1822 76.0 202.333
1823 180.0 219.667
1824 84.0 221.533
1825 96.0 222.533
1826 160.0 210.667
1827 250.0 220.867
1828 281.0 200.867
1829 380.0 209.867
1830 420.0 216.267
1831 328.0 232.267
1832 105.0 248.667
1833 90.0 266.4
1834 233.0 280.867
1835 70.0 269.533
1836 395.0 256.8
1837 172.0 257.0
1838 420.0 255.4
1839 330.0 245.533
1840 362.0 257.2
1841 377.0 259.867
1842 80.0 256.467
1843 90.0 273.8
1844 383.0 259.467
1845 396.0 259.533
1846 180.0 251.867
1847 280.0 238.333
1848 130.0 234.467
1849 182.0 236.667
1850 330.0 245.667
1851 180.0 245.667
1852 173.0 225.467
1853 305.0 211.067
1854 127.0 220.067
1855 304.0 223.867
1856 410.0 221.2
1857 215.0 214.4
1858 90.0 216.4
1859 80.0 211.333
1860 180.0 227.8
1861 315.0 234.933
1862 337.0 235.267
1863 90.0 226.867
1864 80.0 227.533
1865 360.0 220.933
1866 104.0 220.933
1867 420.0 221.467
1868 412.0 232.133
1869 132.0 238.6
1870 178.0 244.133
1871 420.0 242.933
1872 116.0 246.933
1873 90.0 231.267
1874 88.0 252.333
1875 340.0 229.733
1876 412.0 224.733
1877 420.0 224.4
1878 72.0 223.667
1879 140.0 208.867
1880 125.0 206.067
1881 420.0 228.067
1882 81.0 244.0
1883 337.0 226.733
1884 127.0 207.667
1885 167.0 196.467
1886 198.0 219.667
1887 74.0 215.733
1888 420.0 226.2
1889 327.0 207.733
1890 81.0 214.333
1891 126.0 201.2
1892 252.0 204.933
1893 420.0 215.8
1894 81.0 214.6
1895 282.0 233.667
1896 143.0 211.8
1897 180.0 201.733
1898 140.0 205.267
1899 183.0 202.533
1900 330.0 195.0
1901 180.0 182.667
1902 360.0 189.333
1903 92.0 175.933
1904 176.0 173.733
1905 134.0 172.467
1906 85.0 171.0
1907 139.0 167.267
1908 235.0 157.467
1909 181.0 167.467
1910 81.0 170.133
1911 110.0 174.733
1912 161.0 173.0
1913 118.0 174.133
1914 127.0 176.8
1915 183.0 184.867
1916 330.0 191.2
1917 400.0 197.8
1918 161.0 198.333
1919 150.0 216.467
1920 151.0 214.133
1921 125.0 217.733
1922 260.0 235.267
1923 330.0 226.933
1924 280.0 216.6
1925 89.0 199.8
1926 382.0 198.933
1927 126.0 196.267
1928 172.0 192.2
1929 390.0 193.733
1930 58.0 187.133
1931 175.0 169.8
1932 148.0 155.2
1933 148.0 177.267
1934 110.0 176.533
1935 90.0 196.133
1936 148.0 190.267
1937 161.0 168.533
1938 70.0 171.933
1939 61.0 174.6
1940 420.0 192.733
1941 371.0 196.267
1942 420.0 193.067
1943 84.0 194.6
1944 64.0 194.667
1945 109.0 191.933
1946 215.0 197.467
1947 420.0 211.533
1948 201.0 193.667
1949 62.0 195.467
1950 113.0 178.733
1951 149.0 186.2
1952 120.0 187.933
1953 153.0 195.867
1954 272.0 185.933
1955 152.0 169.933
1956 398.0 178.467
1957 169.0 186.667
1958 196.0 193.2
1959 90.0 206.133
1960 228.0 211.733
1961 66.0 215.733
1962 180.0 213.667
1963 329.0 224.467
1964 185.0 210.333
1965 211.0 212.0
1966 343.0 205.0
1967 204.0 205.4
1968 213.0 195.2
1969 241.0 203.867
1970 314.0 205.533
1971 186.0 197.933
1972 194.0 206.867
1973 91.0 210.2
1974 96.0 201.067
1975 75.0 203.267
1976 196.0 198.067
1977 205.0 195.2
1978 215.0 198.867
1979 319.0 208.733
1980 261.0 222.933
1981 206.0 227.067
1982 237.0 224.667
1983 135.0 224.333
1984 198.0 219.667
1985 369.0 210.933
1986 334.0 203.133
1987 407.0 196.6
1988 153.0 184.267
1989 60.0 188.2
1990 70.0 181.0
1991 126.0 180.667
1992 74.0 177.933
1993 98.0 159.733
1994 221.0 146.067
1995 76.0 125.733
1996 265.0 131.067
1997 129.0 137.267
1998 130.0 144.467
1999 157.0 150.133
2000 96.0 154.533
2001 129.0 151.267
2002 102.0 143.867
2003 233.0 155.067
2004 153.0 158.0
2005 178.0 161.333
2006 211.0 164.467
2007 140.0 160.667
2008 49.0 157.667
2009 110.0 156.4
2010 244.0 155.467
2011 309.0 151.6
2012 179.0
2013 177.0
2014 100.0
2015 51.0
2016 110.0
2017 88.0
2018 175.0