Year Years
1800 35
1801 35
1802 35
1803 35
1804 35
1805 35
1806 35
1807 35
1808 35
1809 35
1810 35
1811 35
1812 35
1813 35
1814 35
1815 35
1816 35
1817 35
1818 35
1819 35
1820 35
1821 35
1822 35
1823 35
1824 35
1825 35
1826 35
1827 35
1828 35
1829 35
1830 35
1831 35
1832 35
1833 35
1834 35
1835 35
1836 35
1837 35
1838 35
1839 35
1840 35
1841 35
1842 35
1843 35
1844 35
1845 35
1846 35
1847 35
1848 35
1849 35
1850 35
1851 35
1852 35
1853 35
1854 35
1855 35
1856 35
1857 35
1858 35
1859 35
1860 35
1861 35
1862 35
1863 35
1864 35
1865 35
1866 35
1867 35
1868 35
1869 35
1870 35
1871 35.03
1872 35.06
1873 35.1
1874 35.13
1875 35.16
1876 35.19
1877 35.22
1878 35.25
1879 35.29
1880 35.32
1881 35.35
1882 35.38
1883 35.41
1884 35.45
1885 35.48
1886 35.51
1887 35.54
1888 35.57
1889 35.61
1890 35.64
1891 35.67
1892 35.7
1893 35.73
1894 35.76
1895 35.8
1896 35.83
1897 35.86
1898 35.89
1899 35.92
1900 35.96
1901 35.99
1902 36.02
1903 36.05
1904 36.08
1905 36.12
1906 36.15
1907 36.18
1908 36.21
1909 36.24
1910 36.27
1911 36.31
1912 36.34
1913 36.37
1914 28.08
1915 7.29
1916 19.8
1917 22.94
1918 19.9
1919 31.34
1920 30.32
1921 30.35
1922 34.56
1923 36.69
1924 36.72
1925 36.75
1926 36.78
1927 36.82
1928 36.85
1929 36.88
1930 36.91
1931 37.01
1932 37.1
1933 37.2
1934 37.3
1935 37.4
1936 37.5
1937 37.59
1938 36.75
1939 35.91
1940 35.08
1941 34.24
1942 33.39
1943 34.86
1944 36.33
1945 37.82
1946 39.29
1947 40.77
1948 41.54
1949 42.32
1950 43.1
1951 43.34
1952 43.8
1953 44.31
1954 44.87
1955 45.47
1956 46.11
1957 46.79
1958 47.52
1959 48.29
1960 49.09
1961 49.92
1962 50.75
1963 51.61
1964 52.44
1965 53.28
1966 54.09
1967 54.86
1968 55.62
1969 56.34
1970 57.05
1971 57.78
1972 58.48
1973 59.03
1974 59.6
1975 60.18
1976 60.89
1977 61.99
1978 62.86
1979 63.27
1980 64.16
1981 65.03
1982 65.82
1983 66.56
1984 67.48
1985 68
1986 68.63
1987 69.91
1988 70.41
1989 70.11
1990 70.16
1991 70.18
1992 70.46
1993 70.57
1994 70.72
1995 70.92
1996 71.43
1997 71.94
1998 72.62
1999 71.97
2000 74.11
2001 74.8
2002 75.39
2003 75.46
2004 76.27
2005 76.65
2006 77.23
2007 78.12
2008 78.76
2009 78.15
2010 78.21
2011 78.23
2012 78.58
2013 78.44
2014 78.76
2015 78.95
2016 79.09
2017 79.35
2018 79.61