Year Years
1800 36.57
1801 40.3
1802 39.2
1803 28.53
1804 35.91
1805 39.8
1806 38.78
1807 36.6
1808 12.48
1809 13.43
1810 36.95
1811 30.69
1812 37.61
1813 34.18
1814 34.99
1815 35.72
1816 38.69
1817 38.09
1818 37.17
1819 35.03
1820 37.29
1821 40.16
1822 34.9
1823 38.91
1824 35.83
1825 37.26
1826 38.13
1827 42.21
1828 40.65
1829 36.3
1830 36.3
1831 34.05
1832 28.95
1833 20.38
1834 38.9
1835 37.79
1836 30.78
1837 34.38
1838 40.12
1839 42.66
1840 41.47
1841 41.01
1842 41.76
1843 41.54
1844 42.17
1845 40.86
1846 38.61
1847 40.84
1848 40.19
1849 39.42
1850 37.35
1851 40.33
1852 32.86
1853 33.57
1854 37.97
1855 31.94
1856 29.96
1857 30.12
1858 33.81
1859 38.5
1860 38.15
1861 38.02
1862 34.13
1863 32.38
1864 39.64
1865 35.78
1866 28.74
1867 25.33
1868 8.11
1869 37.12
1870 45.66
1871 46.25
1872 44.07
1873 39.51
1874 39.09
1875 40.64
1876 41.8
1877 38.96
1878 39.16
1879 44.93
1880 39.65
1881 37.63
1882 40.44
1883 42.76
1884 42.84
1885 41.27
1886 40.89
1887 45.56
1888 45.12
1889 44.89
1890 44.57
1891 42.53
1892 39.69
1893 43.29
1894 45.17
1895 47.59
1896 46.5
1897 48.1
1898 48.01
1899 44.34
1900 41.74
1901 42.81
1902 46.16
1903 46.57
1904 47.14
1905 45.97
1906 46.99
1907 46.9
1908 46.07
1909 48.58
1910 48.44
1911 48.64
1912 49.04
1913 48.95
1914 49.63
1915 49.44
1916 47.93
1917 46.39
1918 32.64
1919 42.97
1920 47.44
1921 52.29
1922 51.8
1923 52.39
1924 50.1
1925 53.29
1926 53.69
1927 51.73
1928 53.57
1929 51.14
1930 54.32
1931 54.73
1932 55.63
1933 55.29
1934 55.88
1935 57.19
1936 55.99
1937 56.93
1938 57.02
1939 54.5
1940 46.5
1941 46.35
1942 53.72
1943 56.08
1944 47.84
1945 57
1946 60.06
1947 60.32
1948 61.77
1949 61.66
1950 64.01
1951 65.43
1952 66.3
1953 66.36
1954 67.31
1955 67.11
1956 67.72
1957 67.22
1958 68.36
1959 68.53
1960 68.73
1961 68.75
1962 68.46
1963 68.87
1964 69.07
1965 68.83
1966 69.35
1967 69.52
1968 69.48
1969 69.36
1970 70.04
1971 70.35
1972 70.77
1973 71.19
1974 71.39
1975 71.65
1976 71.98
1977 72.39
1978 72.86
1979 73.25
1980 73.55
1981 73.9
1982 74.21
1983 74.36
1984 74.47
1985 74.49
1986 74.64
1987 74.68
1988 74.72
1989 74.81
1990 74.99
1991 75.28
1992 75.63
1993 75.99
1994 76.35
1995 76.61
1996 76.78
1997 77.01
1998 77.21
1999 77.41
2000 77.73
2001 78.06
2002 78.32
2003 78.49
2004 78.68
2005 78.93
2006 79.14
2007 79.35
2008 79.59
2009 79.78
2010 80
2011 80.29
2012 80.54
2013 80.9
2014 81.24
2015 81.5
2016 81.72
2017 81.89
2018 82.06