Year Years
1800 30.21
1801 30.21
1802 30.21
1803 30.21
1804 30.21
1805 30.21
1806 30.21
1807 30.21
1808 30.21
1809 30.21
1810 30.21
1811 30.21
1812 30.21
1813 30.21
1814 30.21
1815 30.21
1816 30.21
1817 30.21
1818 30.21
1819 30.21
1820 30.21
1821 30.21
1822 30.21
1823 30.21
1824 30.21
1825 30.21
1826 30.21
1827 30.21
1828 30.21
1829 30.21
1830 30.21
1831 30.21
1832 30.21
1833 30.21
1834 30.21
1835 30.21
1836 30.21
1837 30.21
1838 30.21
1839 30.21
1840 30.21
1841 30.21
1842 30.21
1843 30.21
1844 30.21
1845 30.21
1846 30.21
1847 30.21
1848 30.21
1849 30.21
1850 30.21
1851 30.21
1852 30.21
1853 30.21
1854 30.21
1855 30.21
1856 30.21
1857 30.21
1858 30.21
1859 30.21
1860 30.21
1861 30.21
1862 30.21
1863 30.21
1864 30.21
1865 30.21
1866 30.21
1867 30.21
1868 30.21
1869 30.21
1870 30.21
1871 30.22
1872 30.23
1873 30.24
1874 30.25
1875 30.26
1876 30.27
1877 30.28
1878 30.29
1879 30.3
1880 30.31
1881 30.32
1882 30.33
1883 30.34
1884 30.35
1885 30.35
1886 30.36
1887 30.37
1888 30.37
1889 30.38
1890 30.81
1891 31.23
1892 31.65
1893 32.08
1894 32.5
1895 32.91
1896 33.34
1897 33.76
1898 34.19
1899 34.61
1900 35.03
1901 35.09
1902 35.14
1903 35.19
1904 35.24
1905 35.29
1906 35.34
1907 35.4
1908 35.45
1909 35.5
1910 35.55
1911 35.56
1912 35.57
1913 35.59
1914 35.6
1915 35.61
1916 35.62
1917 35.63
1918 31.51
1919 35.65
1920 35.66
1921 36.4
1922 37.13
1923 37.86
1924 38.6
1925 39.33
1926 40.07
1927 40.8
1928 41.54
1929 42.28
1930 43.01
1931 43.51
1932 44
1933 44.49
1934 44.99
1935 45.48
1936 45.98
1937 46.47
1938 46.97
1939 47.46
1940 47.96
1941 48.91
1942 49.87
1943 50.83
1944 51.79
1945 52.75
1946 53.71
1947 54.67
1948 55.63
1949 56.59
1950 57.55
1951 57.87
1952 58.47
1953 59.09
1954 59.69
1955 60.31
1956 60.92
1957 61.54
1958 62.15
1959 62.77
1960 63.38
1961 63.99
1962 64.59
1963 65.17
1964 65.75
1965 66.31
1966 66.85
1967 67.39
1968 67.91
1969 68.42
1970 68.94
1971 69.48
1972 70.04
1973 70.64
1974 71.22
1975 71.83
1976 72.44
1977 73.06
1978 73.62
1979 74.13
1980 74.6
1981 74.97
1982 75.28
1983 75.54
1984 75.75
1985 75.93
1986 76.1
1987 76.26
1988 76.35
1989 76.47
1990 76.57
1991 76.58
1992 76.72
1993 76.82
1994 76.91
1995 77.02
1996 77.11
1997 77.29
1998 77.53
1999 77.77
2000 78
2001 78.26
2002 78.52
2003 78.78
2004 79.08
2005 79.35
2006 79.62
2007 79.95
2008 80.15
2009 80.31
2010 80.4
2011 80.53
2012 80.6
2013 80.7
2014 80.8
2015 80.92
2016 81.02
2017 81.22
2018 81.42