Year Years
1800 30.9
1801 30.9
1802 30.9
1803 30.9
1804 30.9
1805 30.9
1806 30.9
1807 30.9
1808 30.9
1809 30.9
1810 30.9
1811 30.9
1812 30.9
1813 30.9
1814 30.9
1815 30.9
1816 30.9
1817 30.9
1818 30.9
1819 30.9
1820 30.9
1821 30.9
1822 30.9
1823 30.9
1824 30.9
1825 30.9
1826 30.9
1827 30.9
1828 30.9
1829 30.9
1830 30.9
1831 30.9
1832 30.9
1833 30.9
1834 30.9
1835 30.9
1836 30.9
1837 30.9
1838 30.9
1839 30.9
1840 30.9
1841 30.9
1842 30.9
1843 30.9
1844 30.9
1845 30.9
1846 30.9
1847 30.9
1848 30.9
1849 30.9
1850 30.9
1851 30.9
1852 30.9
1853 30.9
1854 30.9
1855 30.9
1856 30.9
1857 30.9
1858 30.9
1859 30.9
1860 30.9
1861 30.9
1862 30.9
1863 30.9
1864 30.9
1865 30.9
1866 30.9
1867 30.9
1868 30.9
1869 30.9
1870 30.9
1871 30.96
1872 31.02
1873 31.08
1874 31.13
1875 31.19
1876 31.25
1877 31.31
1878 31.37
1879 31.43
1880 31.49
1881 31.55
1882 31.6
1883 31.66
1884 31.72
1885 31.78
1886 31.84
1887 31.9
1888 31.96
1889 32.02
1890 32.07
1891 32.13
1892 32.19
1893 32.25
1894 32.31
1895 32.37
1896 32.43
1897 32.49
1898 32.54
1899 32.6
1900 32.66
1901 32.72
1902 32.78
1903 32.84
1904 32.9
1905 32.96
1906 33.01
1907 33.07
1908 33.13
1909 33.19
1910 33.25
1911 33.31
1912 33.37
1913 33.43
1914 33.48
1915 33.54
1916 33.6
1917 33.66
1918 19.75
1919 33.78
1920 33.84
1921 33.89
1922 33.95
1923 34.01
1924 34.07
1925 34.13
1926 34.19
1927 34.25
1928 34.31
1929 34.36
1930 34.42
1931 34.48
1932 34.54
1933 34.6
1934 34.66
1935 34.72
1936 34.78
1937 34.83
1938 34.89
1939 34.95
1940 35.01
1941 35.07
1942 35.13
1943 35.19
1944 35.25
1945 35.3
1946 36.43
1947 37.55
1948 38.68
1949 39.82
1950 40.97
1951 41.17
1952 41.53
1953 41.9
1954 42.26
1955 42.63
1956 43.01
1957 43.39
1958 43.77
1959 44.15
1960 44.52
1961 44.9
1962 45.28
1963 45.66
1964 46.05
1965 46.45
1966 46.91
1967 47.41
1968 47.97
1969 48.56
1970 49.18
1971 48.97
1972 49.85
1973 50.72
1974 50.89
1975 51.21
1976 50.83
1977 51.05
1978 51.31
1979 51.29
1980 51.23
1981 50.94
1982 50.86
1983 51.12
1984 51.47
1985 52.4
1986 52.32
1987 51.21
1988 53.5
1989 53.56
1990 53.26
1991 53.45
1992 53.46
1993 53.62
1994 53.43
1995 53.45
1996 52.99
1997 52.73
1998 52.44
1999 52.37
2000 52.16
2001 52.44
2002 52.59
2003 52.76
2004 53.11
2005 53.85
2006 54.06
2007 54.88
2008 55.18
2009 55.91
2010 56.49
2011 56.97
2012 57.53
2013 58.16
2014 58.68
2015 59.19
2016 59.84
2017 60.18
2018 60.52