Year Years
1800 29.5
1801 29.5
1802 29.5
1803 29.5
1804 29.5
1805 29.5
1806 29.5
1807 29.5
1808 29.5
1809 29.5
1810 29.5
1811 29.5
1812 29.5
1813 29.5
1814 29.5
1815 29.5
1816 29.5
1817 29.5
1818 29.5
1819 29.5
1820 29.5
1821 29.5
1822 29.5
1823 29.5
1824 29.5
1825 29.5
1826 29.5
1827 29.5
1828 29.5
1829 29.5
1830 29.5
1831 29.5
1832 29.5
1833 29.5
1834 29.5
1835 29.5
1836 29.5
1837 29.5
1838 29.5
1839 29.5
1840 29.5
1841 29.5
1842 29.5
1843 29.5
1844 29.5
1845 29.5
1846 29.5
1847 29.5
1848 29.5
1849 29.5
1850 29.5
1851 29.5
1852 29.5
1853 29.5
1854 29.5
1855 29.5
1856 29.5
1857 29.5
1858 29.5
1859 29.5
1860 29.5
1861 29.5
1862 29.5
1863 29.5
1864 29.5
1865 29.5
1866 29.5
1867 29.5
1868 29.5
1869 29.5
1870 29.5
1871 29.5
1872 29.5
1873 29.5
1874 29.49
1875 29.49
1876 29.49
1877 29.49
1878 29.49
1879 29.49
1880 29.49
1881 29.48
1882 29.48
1883 29.74
1884 30
1885 30.26
1886 30.52
1887 30.78
1888 31.03
1889 31.29
1890 31.55
1891 31.81
1892 32.07
1893 32.41
1894 32.74
1895 33.07
1896 33.41
1897 33.75
1898 34.09
1899 34.41
1900 34.75
1901 35.58
1902 36.41
1903 37.23
1904 38.07
1905 38.9
1906 39.72
1907 40.55
1908 41.38
1909 40.99
1910 40.84
1911 39.72
1912 43.45
1913 42.48
1914 42.75
1915 42.96
1916 43.89
1917 42.54
1918 30.22
1919 41.03
1920 39.22
1921 41.93
1922 44.1
1923 44.64
1924 46.18
1925 46.83
1926 47.64
1927 48.36
1928 48.54
1929 49.35
1930 49.2
1931 49.11
1932 51.05
1933 51.45
1934 52.09
1935 52.56
1936 50.74
1937 47.07
1938 47.38
1939 46.94
1940 48.23
1941 47
1942 52.3
1943 54.66
1944 56.06
1945 57.64
1946 57.37
1947 59.12
1948 61.05
1949 60.8
1950 61.64
1951 61.29
1952 64.69
1953 65.56
1954 66.75
1955 66.52
1956 66.55
1957 66.39
1958 68.57
1959 68.49
1960 68.98
1961 69.37
1962 69.39
1963 69.55
1964 70.27
1965 70.68
1966 70.93
1967 71.12
1968 71.4
1969 70.93
1970 71.91
1971 72.06
1972 72.55
1973 72.74
1974 73.1
1975 73.46
1976 73.85
1977 74.19
1978 74.53
1979 74.94
1980 75.37
1981 75.61
1982 75.98
1983 76.07
1984 76.31
1985 76.43
1986 76.6
1987 76.79
1988 76.91
1989 77.01
1990 77.11
1991 77.3
1992 77.51
1993 77.69
1994 77.94
1995 78.15
1996 78.36
1997 78.7
1998 78.92
1999 79.1
2000 79.39
2001 79.66
2002 79.82
2003 79.97
2004 80.24
2005 80.47
2006 80.81
2007 81.05
2008 81.34
2009 81.65
2010 81.94
2011 82.15
2012 82.29
2013 82.6
2014 82.8
2015 82.87
2016 82.93
2017 83.09
2018 83.23