Year Years
1800 30.3
1801 30.3
1802 30.3
1803 30.3
1804 30.3
1805 30.3
1806 30.3
1807 30.3
1808 30.3
1809 30.3
1810 30.3
1811 30.3
1812 30.3
1813 30.3
1814 30.3
1815 30.3
1816 30.3
1817 30.3
1818 30.3
1819 30.3
1820 30.3
1821 30.3
1822 30.3
1823 30.3
1824 30.3
1825 30.3
1826 30.3
1827 30.3
1828 30.3
1829 30.3
1830 30.3
1831 30.3
1832 30.3
1833 30.3
1834 30.3
1835 30.3
1836 30.3
1837 30.3
1838 30.3
1839 30.3
1840 30.3
1841 30.3
1842 30.3
1843 30.3
1844 30.3
1845 30.3
1846 30.3
1847 30.3
1848 30.3
1849 30.3
1850 30.3
1851 30.3
1852 30.3
1853 30.3
1854 30.3
1855 30.3
1856 30.3
1857 30.3
1858 30.3
1859 30.3
1860 30.3
1861 30.3
1862 30.3
1863 30.3
1864 30.3
1865 30.3
1866 30.3
1867 30.3
1868 30.3
1869 30.3
1870 30.3
1871 30.32
1872 30.34
1873 30.36
1874 30.39
1875 30.41
1876 30.43
1877 30.45
1878 30.47
1879 30.49
1880 30.51
1881 30.54
1882 30.56
1883 30.58
1884 30.6
1885 30.62
1886 30.64
1887 30.66
1888 30.69
1889 30.71
1890 30.73
1891 30.75
1892 30.77
1893 30.79
1894 30.81
1895 30.83
1896 30.86
1897 30.88
1898 30.9
1899 30.92
1900 30.94
1901 30.96
1902 30.98
1903 31.01
1904 31.03
1905 31.05
1906 31.07
1907 31.09
1908 31.11
1909 31.13
1910 31.16
1911 31.18
1912 31.2
1913 31.22
1914 31.24
1915 31.26
1916 31.28
1917 31.31
1918 12.12
1919 31.35
1920 31.37
1921 31.39
1922 31.41
1923 31.43
1924 31.46
1925 31.48
1926 31.5
1927 31.52
1928 31.54
1929 31.56
1930 31.58
1931 31.61
1932 31.63
1933 31.65
1934 31.67
1935 31.69
1936 31.71
1937 31.73
1938 31.76
1939 31.78
1940 31.8
1941 31.82
1942 31.84
1943 31.86
1944 31.88
1945 31.9
1946 33.13
1947 34.36
1948 35.59
1949 36.83
1950 38.06
1951 38.15
1952 38.33
1953 38.52
1954 38.73
1955 38.96
1956 39.2
1957 39.45
1958 39.72
1959 40
1960 40.27
1961 40.53
1962 40.79
1963 41.03
1964 41.28
1965 41.54
1966 41.84
1967 42.18
1968 42.58
1969 43.02
1970 43.51
1971 44.1
1972 44.73
1973 45.3
1974 45.86
1975 46.4
1976 46.92
1977 47.39
1978 48.05
1979 48.85
1980 49.37
1981 49.67
1982 49.93
1983 50.06
1984 50.16
1985 50.07
1986 49.81
1987 49.6
1988 49.36
1989 48.96
1990 48.72
1991 48.35
1992 47.86
1993 47.31
1994 46.56
1995 46.01
1996 45.43
1997 45.02
1998 44.57
1999 44.42
2000 44.73
2001 45.15
2002 45.55
2003 46.21
2004 46.82
2005 47.62
2006 48.47
2007 49.49
2008 50.6
2009 51.84
2010 53.07
2011 54.53
2012 56.12
2013 57.5
2014 58.52
2015 59.44
2016 60.25
2017 60.67
2018 61.03