Year Years
1800 29.9
1801 29.9
1802 29.9
1803 29.9
1804 29.9
1805 29.9
1806 29.9
1807 29.9
1808 29.9
1809 29.9
1810 29.9
1811 29.9
1812 29.9
1813 29.9
1814 29.9
1815 29.9
1816 29.9
1817 29.9
1818 29.9
1819 29.9
1820 29.9
1821 29.9
1822 29.9
1823 29.9
1824 29.9
1825 29.9
1826 29.9
1827 29.9
1828 29.9
1829 29.9
1830 29.9
1831 29.9
1832 29.9
1833 29.9
1834 29.9
1835 29.9
1836 29.9
1837 29.9
1838 29.9
1839 29.9
1840 29.9
1841 29.9
1842 29.9
1843 29.9
1844 29.9
1845 29.9
1846 29.9
1847 29.9
1848 29.9
1849 29.9
1850 29.9
1851 29.9
1852 29.9
1853 29.9
1854 29.9
1855 29.9
1856 29.9
1857 29.9
1858 29.9
1859 29.9
1860 29.9
1861 29.9
1862 29.9
1863 29.9
1864 29.9
1865 29.9
1866 29.9
1867 29.9
1868 29.9
1869 29.9
1870 29.9
1871 29.96
1872 30.03
1873 30.09
1874 30.16
1875 30.22
1876 30.29
1877 30.35
1878 30.42
1879 30.48
1880 30.55
1881 30.61
1882 30.67
1883 30.74
1884 30.8
1885 30.87
1886 30.93
1887 31
1888 31.06
1889 31.13
1890 31.19
1891 31.26
1892 31.32
1893 31.39
1894 31.45
1895 31.51
1896 31.58
1897 31.64
1898 31.71
1899 31.77
1900 31.84
1901 31.9
1902 31.97
1903 32.03
1904 32.1
1905 32.16
1906 32.22
1907 32.29
1908 32.35
1909 32.42
1910 32.48
1911 32.55
1912 32.61
1913 32.68
1914 32.74
1915 32.81
1916 32.87
1917 32.93
1918 12.76
1919 33.06
1920 33.13
1921 33.19
1922 33.26
1923 33.32
1924 33.39
1925 33.45
1926 33.52
1927 33.58
1928 33.65
1929 33.71
1930 33.77
1931 33.84
1932 33.9
1933 33.97
1934 34.03
1935 34.1
1936 34.16
1937 34.23
1938 34.29
1939 34.36
1940 34.42
1941 34.48
1942 34.55
1943 34.61
1944 34.68
1945 34.74
1946 37.25
1947 39.76
1948 42.29
1949 44.81
1950 47.36
1951 47.62
1952 48.08
1953 48.57
1954 49.1
1955 49.63
1956 50.19
1957 50.77
1958 51.37
1959 51.98
1960 52.6
1961 53.21
1962 53.81
1963 54.41
1964 55.01
1965 55.64
1966 56.32
1967 57.09
1968 57.93
1969 58.85
1970 59.78
1971 59.44
1972 60.29
1973 60.58
1974 60.73
1975 60.84
1976 61.14
1977 61.2
1978 61.18
1979 60.7
1980 61.1
1981 60.9
1982 61.04
1983 60.99
1984 61.04
1985 61.08
1986 61.19
1987 61.3
1988 61.35
1989 61.4
1990 61.27
1991 61.2
1992 61.02
1993 61.2
1994 60.8
1995 61.37
1996 61.39
1997 61.25
1998 61.37
1999 61.32
2000 61.37
2001 61.53
2002 61.58
2003 61.68
2004 61.69
2005 62.04
2006 61.93
2007 62.55
2008 62.91
2009 63.33
2010 63.69
2011 64.15
2012 64.61
2013 65.1
2014 65.61
2015 66.07
2016 66.73
2017 66.92
2018 67.1