Year Years
1800 29.4
1801 29.4
1802 29.4
1803 29.4
1804 29.4
1805 29.4
1806 29.4
1807 29.4
1808 29.4
1809 29.4
1810 29.4
1811 29.4
1812 29.4
1813 29.4
1814 29.4
1815 29.4
1816 29.4
1817 29.4
1818 29.4
1819 29.4
1820 29.4
1821 29.4
1822 29.4
1823 29.4
1824 29.4
1825 29.4
1826 29.4
1827 29.4
1828 29.4
1829 29.4
1830 29.4
1831 29.4
1832 29.4
1833 29.4
1834 29.4
1835 29.4
1836 29.4
1837 29.4
1838 29.4
1839 29.4
1840 29.4
1841 29.4
1842 29.4
1843 29.4
1844 29.4
1845 29.4
1846 29.4
1847 29.4
1848 29.4
1849 29.4
1850 29.4
1851 29.4
1852 29.4
1853 29.4
1854 29.4
1855 29.4
1856 29.4
1857 29.4
1858 29.4
1859 29.4
1860 29.4
1861 29.4
1862 29.4
1863 29.4
1864 29.4
1865 29.4
1866 29.4
1867 29.4
1868 29.4
1869 29.4
1870 29.4
1871 29.46
1872 29.53
1873 29.59
1874 29.65
1875 29.72
1876 29.78
1877 29.84
1878 29.91
1879 29.97
1880 30.03
1881 30.1
1882 30.16
1883 30.22
1884 30.29
1885 30.35
1886 30.41
1887 30.48
1888 30.54
1889 30.61
1890 30.67
1891 30.73
1892 30.8
1893 30.86
1894 30.92
1895 30.99
1896 31.05
1897 31.11
1898 31.18
1899 31.24
1900 31.3
1901 31.37
1902 31.43
1903 31.49
1904 31.56
1905 31.62
1906 31.68
1907 31.75
1908 31.81
1909 31.87
1910 31.94
1911 32
1912 32.06
1913 32.13
1914 32.19
1915 32.25
1916 32.32
1917 32.38
1918 17.11
1919 32.51
1920 32.57
1921 32.63
1922 32.7
1923 32.76
1924 32.82
1925 32.89
1926 32.95
1927 33.02
1928 33.08
1929 33.14
1930 33.21
1931 33.27
1932 33.33
1933 33.4
1934 33.46
1935 33.52
1936 33.59
1937 33.65
1938 33.71
1939 33.78
1940 33.84
1941 33.9
1942 33.97
1943 34.03
1944 34.09
1945 34.16
1946 35.1
1947 36.04
1948 37
1949 37.95
1950 38.91
1951 39.21
1952 39.77
1953 40.31
1954 40.86
1955 41.41
1956 41.96
1957 42.51
1958 43.06
1959 43.6
1960 44.16
1961 44.72
1962 45.27
1963 45.84
1964 46.4
1965 46.97
1966 47.54
1967 48.1
1968 48.67
1969 49.23
1970 49.8
1971 49.86
1972 50.08
1973 50.2
1974 47.65
1975 47.94
1976 48.18
1977 50.71
1978 50.7
1979 50.88
1980 50.78
1981 50.77
1982 50.64
1983 50.53
1984 50.58
1985 50.28
1986 50.13
1987 50.63
1988 47.8
1989 50.96
1990 50.66
1991 49.13
1992 50.16
1993 51.51
1994 51.04
1995 51.41
1996 51.28
1997 50.95
1998 51.67
1999 51.82
2000 52.06
2001 52.46
2002 52.73
2003 53.14
2004 53.39
2005 53.9
2006 54.04
2007 54.14
2008 54.76
2009 55.02
2010 53.13
2011 53.4
2012 55.85
2013 56.61
2014 56.94
2015 57.25
2016 57.19
2017 57.61
2018 58.03