Year Years
1800 33
1801 33
1802 33
1803 33
1804 33
1805 33
1806 33
1807 33
1808 33
1809 33
1810 33
1811 33
1812 33
1813 33
1814 33
1815 33
1816 33
1817 33
1818 33
1819 33
1820 33
1821 33
1822 33
1823 33
1824 33
1825 33
1826 33
1827 33
1828 33
1829 33
1830 33
1831 33
1832 33
1833 33
1834 33
1835 33
1836 33
1837 33
1838 33
1839 33
1840 33
1841 33
1842 33
1843 33
1844 33
1845 33
1846 33
1847 33
1848 33
1849 33
1850 33
1851 33
1852 33
1853 33
1854 33
1855 33
1856 33
1857 33
1858 33
1859 33
1860 33
1861 33
1862 33
1863 33
1864 33
1865 33
1866 33
1867 33
1868 33
1869 33
1870 33
1871 33
1872 33
1873 33
1874 33
1875 33
1876 33
1877 33
1878 33
1879 33
1880 33
1881 33
1882 33
1883 33
1884 33
1885 33
1886 33
1887 33
1888 33
1889 33
1890 33
1891 33
1892 33
1893 33
1894 33
1895 33
1896 33
1897 33
1898 33
1899 33
1900 33
1901 33
1902 33
1903 33
1904 33
1905 33
1906 33
1907 33
1908 33
1909 33
1910 33
1911 33
1912 33
1913 33
1914 33
1915 33
1916 33
1917 33
1918 12.76
1919 33
1920 33
1921 33
1922 33
1923 33
1924 33
1925 33
1926 33
1927 33
1928 33
1929 33
1930 33
1931 33
1932 33
1933 33
1934 33
1935 33
1936 33
1937 33
1938 33
1939 33
1940 33
1941 33
1942 33
1943 33
1944 33
1945 33
1946 35.46
1947 37.92
1948 40.39
1949 42.85
1950 45.31
1951 45.98
1952 47.28
1953 48.53
1954 49.72
1955 50.86
1956 51.94
1957 52.96
1958 53.93
1959 54.85
1960 55.73
1961 56.57
1962 57.37
1963 58.15
1964 58.9
1965 59.64
1966 60.36
1967 61.06
1968 61.74
1969 62.41
1970 63.06
1971 63.69
1972 64.3
1973 64.89
1974 65.46
1975 66
1976 66.53
1977 67.05
1978 67.55
1979 68.03
1980 68.51
1981 68.97
1982 69.43
1983 69.87
1984 70.3
1985 70.73
1986 71.14
1987 71.54
1988 71.94
1989 72.32
1990 72.69
1991 73.06
1992 73.41
1993 73.77
1994 74.11
1995 74.45
1996 74.79
1997 75.12
1998 75.44
1999 75.76
2000 76.08
2001 76.38
2002 76.68
2003 76.97
2004 77.26
2005 77.53
2006 77.81
2007 78.08
2008 78.35
2009 78.62
2010 78.88
2011 79.14
2012 79.4
2013 79.65
2014 79.89
2015 80.12
2016 80.33
2017 80.54
2018 80.75