Year Years
1800 25.1
1801 25.1
1802 25.1
1803 25.1
1804 25.1
1805 25.1
1806 25.1
1807 25.1
1808 25.1
1809 25.1
1810 25.1
1811 25.1
1812 25.1
1813 25.1
1814 25.1
1815 25.1
1816 25.1
1817 25.1
1818 25.1
1819 25.1
1820 25.1
1821 25.1
1822 25.1
1823 25.1
1824 25.1
1825 25.1
1826 25.1
1827 25.1
1828 25.1
1829 25.1
1830 25.1
1831 25.1
1832 25.1
1833 25.1
1834 25.1
1835 25.1
1836 25.1
1837 25.1
1838 25.1
1839 25.1
1840 25.1
1841 25.1
1842 25.1
1843 25.1
1844 25.1
1845 25.1
1846 25.1
1847 25.1
1848 25.1
1849 25.1
1850 25.1
1851 25.1
1852 25.1
1853 25.1
1854 25.1
1855 25.1
1856 25.1
1857 25.1
1858 25.1
1859 25.1
1860 25.1
1861 25.1
1862 25.1
1863 25.1
1864 25.1
1865 25.1
1866 25.1
1867 25.1
1868 25.1
1869 25.1
1870 25.1
1871 25.18
1872 25.26
1873 25.34
1874 25.42
1875 25.5
1876 25.58
1877 25.66
1878 25.74
1879 25.82
1880 25.9
1881 25.98
1882 26.06
1883 26.14
1884 26.22
1885 26.3
1886 26.38
1887 26.46
1888 26.54
1889 26.62
1890 26.7
1891 26.78
1892 26.85
1893 26.93
1894 27.01
1895 27.09
1896 27.17
1897 27.25
1898 27.33
1899 27.41
1900 27.49
1901 27.57
1902 27.65
1903 27.73
1904 27.81
1905 27.89
1906 27.97
1907 28.05
1908 28.13
1909 28.21
1910 28.29
1911 28.37
1912 28.45
1913 28.53
1914 28.61
1915 28.69
1916 28.77
1917 28.85
1918 13.67
1919 29.01
1920 29.09
1921 29.17
1922 29.25
1923 29.33
1924 29.41
1925 29.49
1926 29.57
1927 29.5
1928 29.44
1929 29.38
1930 29.31
1931 29.25
1932 29.38
1933 29.51
1934 29.64
1935 29.77
1936 29.89
1937 30.03
1938 30.16
1939 30.29
1940 30.43
1941 30.55
1942 30.68
1943 30.81
1944 30.95
1945 31.08
1946 31.98
1947 32.9
1948 33.8
1949 34.73
1950 35.65
1951 35.86
1952 36.19
1953 36.54
1954 36.88
1955 37.24
1956 37.6
1957 37.96
1958 38.33
1959 38.69
1960 39.06
1961 39.42
1962 39.79
1963 40.17
1964 40.6
1965 41.1
1966 41.72
1967 42.49
1968 43.41
1969 44.45
1970 45.6
1971 46.01
1972 46.36
1973 46.7
1974 47.02
1975 47.29
1976 47.54
1977 47.75
1978 47.93
1979 48.09
1980 48.21
1981 48.4
1982 48.62
1983 48.79
1984 49.02
1985 49.24
1986 49.17
1987 49.65
1988 49.95
1989 50.25
1990 50.6
1991 50.38
1992 50.86
1993 51.13
1994 50.46
1995 49.94
1996 51.27
1997 50.77
1998 49.06
1999 49.12
2000 50.93
2001 51.32
2002 51.37
2003 51.72
2004 52.1
2005 52.45
2006 52.88
2007 53.21
2008 53.83
2009 54.31
2010 55.05
2011 55.71
2012 56.44
2013 57.38
2014 53.87
2015 57.62
2016 59.15
2017 59.58
2018 60