Year Years
1800 30.5
1801 30.5
1802 30.5
1803 30.5
1804 30.5
1805 30.5
1806 30.5
1807 30.5
1808 30.5
1809 30.5
1810 30.5
1811 30.5
1812 30.5
1813 30.5
1814 30.5
1815 30.5
1816 30.5
1817 30.5
1818 30.5
1819 30.5
1820 30.5
1821 30.5
1822 30.5
1823 30.5
1824 30.5
1825 30.5
1826 30.5
1827 30.5
1828 30.5
1829 30.5
1830 30.5
1831 30.5
1832 30.5
1833 30.5
1834 30.5
1835 30.5
1836 30.5
1837 30.5
1838 30.5
1839 30.5
1840 30.5
1841 30.5
1842 30.5
1843 30.5
1844 30.5
1845 30.5
1846 30.5
1847 30.5
1848 30.5
1849 30.5
1850 30.5
1851 30.5
1852 30.5
1853 30.5
1854 30.5
1855 30.5
1856 30.5
1857 30.5
1858 30.5
1859 30.5
1860 30.5
1861 30.5
1862 30.5
1863 30.5
1864 30.5
1865 30.5
1866 30.5
1867 30.5
1868 30.5
1869 30.5
1870 30.5
1871 30.54
1872 30.58
1873 30.62
1874 30.66
1875 30.7
1876 30.75
1877 30.79
1878 30.83
1879 30.87
1880 30.91
1881 30.95
1882 30.99
1883 31.03
1884 31.07
1885 31.11
1886 31.15
1887 31.19
1888 31.24
1889 31.28
1890 31.32
1891 31.36
1892 31.4
1893 31.44
1894 31.48
1895 31.52
1896 31.56
1897 31.6
1898 31.64
1899 31.68
1900 31.73
1901 31.77
1902 31.81
1903 31.85
1904 31.89
1905 31.93
1906 31.97
1907 32.01
1908 32.05
1909 32.09
1910 32.13
1911 32.17
1912 32.22
1913 32.26
1914 32.3
1915 32.34
1916 32.38
1917 32.42
1918 13.53
1919 32.5
1920 32.54
1921 32.58
1922 32.62
1923 32.66
1924 32.71
1925 32.75
1926 32.79
1927 32.83
1928 32.87
1929 32.91
1930 32.95
1931 32.99
1932 33.03
1933 33.07
1934 33.11
1935 33.15
1936 33.2
1937 33.24
1938 33.28
1939 33.32
1940 33.36
1941 33.4
1942 33.44
1943 33.48
1944 33.52
1945 33.56
1946 34.67
1947 35.78
1948 36.9
1949 38.02
1950 39.14
1951 39.45
1952 40.04
1953 40.62
1954 41.22
1955 41.8
1956 42.4
1957 43
1958 43.58
1959 44.18
1960 44.78
1961 45.37
1962 45.96
1963 46.55
1964 47.15
1965 47.74
1966 48.34
1967 48.93
1968 49.55
1969 50.15
1970 50.76
1971 51.18
1972 51.81
1973 52.43
1974 52.82
1975 53.1
1976 53.38
1977 53.89
1978 54.27
1979 54.68
1980 54.87
1981 54.78
1982 54.31
1983 54.22
1984 54.15
1985 54.17
1986 53.98
1987 54.11
1988 54.58
1989 55.13
1990 55.59
1991 55.83
1992 56.06
1993 56.06
1994 56.5
1995 56.85
1996 57.19
1997 57.47
1998 57.8
1999 58.23
2000 58.46
2001 58.98
2002 59.13
2003 59.33
2004 59.6
2005 60.08
2006 60.4
2007 60.65
2008 60.76
2009 60.76
2010 60.84
2011 61.11
2012 61.36
2013 61.66
2014 61.96
2015 62.31
2016 62.69
2017 63.05
2018 63.4