Year Years
1800 29.2
1801 29.2
1802 29.2
1803 29.2
1804 29.2
1805 29.2
1806 29.2
1807 29.2
1808 29.2
1809 29.2
1810 29.2
1811 29.2
1812 29.2
1813 29.2
1814 29.2
1815 29.2
1816 29.2
1817 29.2
1818 29.2
1819 29.2
1820 29.2
1821 29.2
1822 29.2
1823 29.2
1824 29.2
1825 29.2
1826 29.2
1827 29.2
1828 29.2
1829 29.2
1830 29.2
1831 29.2
1832 29.2
1833 29.2
1834 29.2
1835 29.2
1836 29.2
1837 29.2
1838 29.2
1839 29.2
1840 29.2
1841 29.2
1842 29.2
1843 29.2
1844 29.2
1845 29.2
1846 29.2
1847 29.2
1848 29.2
1849 29.2
1850 29.2
1851 29.2
1852 29.2
1853 29.2
1854 29.2
1855 29.2
1856 29.2
1857 29.2
1858 29.2
1859 29.2
1860 29.2
1861 29.2
1862 29.2
1863 29.2
1864 29.2
1865 29.2
1866 29.2
1867 29.2
1868 29.2
1869 29.2
1870 29.2
1871 29.19
1872 29.19
1873 29.18
1874 29.17
1875 29.16
1876 29.16
1877 29.15
1878 29.14
1879 29.14
1880 29.13
1881 29.12
1882 29.11
1883 29.11
1884 29.1
1885 29.09
1886 29.09
1887 29.08
1888 29.07
1889 29.06
1890 29.06
1891 29.05
1892 29.04
1893 29.03
1894 29.03
1895 29.02
1896 29.01
1897 29.01
1898 29
1899 28.99
1900 28.98
1901 28.98
1902 28.97
1903 28.96
1904 28.96
1905 28.95
1906 28.94
1907 28.93
1908 28.93
1909 28.92
1910 28.91
1911 28.91
1912 29.59
1913 30.29
1914 30.97
1915 31.66
1916 32.35
1917 33.03
1918 27.38
1919 34.41
1920 35.09
1921 35.78
1922 36.47
1923 37.15
1924 37.83
1925 38.52
1926 39.2
1927 39.88
1928 40.57
1929 41.25
1930 41.93
1931 42.62
1932 43.3
1933 43.98
1934 44.67
1935 45.34
1936 46.02
1937 46.71
1938 47.38
1939 48.06
1940 48.75
1941 49.42
1942 50.1
1943 50.78
1944 51.46
1945 52.14
1946 52.81
1947 53.49
1948 54.17
1949 54.84
1950 55.52
1951 55.8
1952 56.38
1953 56.96
1954 57.55
1955 58.13
1956 58.72
1957 59.31
1958 59.9
1959 60.48
1960 61.04
1961 61.59
1962 62.12
1963 62.63
1964 63.11
1965 63.56
1966 63.99
1967 64.41
1968 64.8
1969 65.19
1970 65.58
1971 66.19
1972 67.07
1973 68.1
1974 69.03
1975 69.23
1976 69.33
1977 69.17
1978 69.23
1979 69.54
1980 69.9
1981 70.22
1982 70.54
1983 71.13
1984 71.74
1985 72.25
1986 72.63
1987 72.99
1988 73.35
1989 73.46
1990 73.53
1991 73.47
1992 73.6
1993 73.82
1994 74.1
1995 74.4
1996 74.67
1997 75.12
1998 75.54
1999 75.86
2000 76
2001 76.26
2002 76.49
2003 76.65
2004 76.75
2005 76.79
2006 76.77
2007 76.77
2008 76.87
2009 76.93
2010 77.08
2011 76.97
2012 76.89
2013 76.92
2014 76.89
2015 76.93
2016 77.02
2017 77.19
2018 77.36