Year Years
1800 29.69
1801 29.69
1802 29.69
1803 29.69
1804 29.69
1805 29.69
1806 29.69
1807 29.69
1808 29.69
1809 29.69
1810 29.69
1811 29.69
1812 29.69
1813 29.69
1814 29.69
1815 29.69
1816 29.69
1817 29.69
1818 29.69
1819 29.69
1820 29.69
1821 29.69
1822 29.69
1823 29.69
1824 29.69
1825 29.69
1826 29.69
1827 29.69
1828 29.69
1829 29.69
1830 29.69
1831 29.69
1832 29.69
1833 29.69
1834 29.69
1835 29.69
1836 29.69
1837 29.69
1838 29.69
1839 29.69
1840 29.69
1841 29.69
1842 29.69
1843 29.69
1844 29.69
1845 29.69
1846 29.69
1847 29.69
1848 29.69
1849 29.69
1850 29.69
1851 29.69
1852 29.69
1853 29.69
1854 29.69
1855 29.69
1856 29.69
1857 29.69
1858 29.69
1859 29.69
1860 29.69
1861 29.69
1862 29.69
1863 29.69
1864 29.69
1865 29.69
1866 29.69
1867 29.69
1868 29.69
1869 29.69
1870 29.69
1871 29.69
1872 29.69
1873 31.6
1874 31.75
1875 31.31
1876 33.6
1877 34.88
1878 34.32
1879 33.95
1880 32.73
1881 34.19
1882 34.28
1883 35.17
1884 36.59
1885 36.82
1886 35.09
1887 35.96
1888 36.91
1889 39.04
1890 38.49
1891 38.45
1892 38.83
1893 39.78
1894 39.9
1895 39.59
1896 40.68
1897 43.27
1898 42.31
1899 43.65
1900 41.64
1901 43.5
1902 42.97
1903 43.13
1904 44.41
1905 43.92
1906 45.06
1907 45.42
1908 43.16
1909 44.64
1910 46.72
1911 44.74
1912 48.95
1913 48.43
1914 49.86
1915 42.31
1916 39.24
1917 37.66
1918 25.6
1919 42.07
1920 45.47
1921 49.21
1922 49.97
1923 51.41
1924 51.47
1925 51.27
1926 50.92
1927 52.53
1928 52.62
1929 52.24
1930 55.15
1931 54.73
1932 54.72
1933 56.24
1934 56.8
1935 56.16
1936 56.69
1937 55.43
1938 56.07
1939 57.58
1940 56.89
1941 54.56
1942 52.39
1943 49.13
1944 52.28
1945 54.72
1946 58.9
1947 61.11
1948 63.37
1949 64.03
1950 65.69
1951 65.23
1952 65.86
1953 66.49
1954 67.81
1955 68.16
1956 67.55
1957 67.72
1958 68.78
1959 69.22
1960 69.11
1961 69.75
1962 69.14
1963 69.25
1964 70.3
1965 70.17
1966 70.91
1967 70.95
1968 70.77
1969 70.79
1970 71.55
1971 71.78
1972 72.04
1973 72.19
1974 72.62
1975 72.84
1976 73.12
1977 73.47
1978 73.74
1979 74.04
1980 74.07
1981 74.51
1982 74.81
1983 74.98
1984 75.37
1985 75.63
1986 75.94
1987 76.24
1988 76.49
1989 76.79
1990 76.98
1991 77.14
1992 77.36
1993 77.57
1994 77.79
1995 78.06
1996 78.27
1997 78.62
1998 78.89
1999 79.19
2000 79.52
2001 79.84
2002 80.08
2003 80.18
2004 80.63
2005 80.82
2006 80.99
2007 81.17
2008 81.37
2009 81.48
2010 81.69
2011 81.83
2012 81.93
2013 82.15
2014 82.21
2015 82.25
2016 82.27
2017 82.45
2018 82.62