Year Years
1800 33.97
1801 36.37
1802 34.38
1803 30.64
1804 29.38
1805 34.88
1806 35
1807 34.2
1808 34.5
1809 35
1810 37.4
1811 36.1
1812 31.7
1813 31.2
1814 30.1
1815 36.5
1816 40.04
1817 39.18
1818 38.53
1819 37.25
1820 39.21
1821 39.83
1822 38.3
1823 39.97
1824 39.14
1825 38.53
1826 37.76
1827 39.35
1828 37.53
1829 39.36
1830 39.56
1831 39.65
1832 35.81
1833 38.83
1834 35.01
1835 39.48
1836 41.95
1837 39.38
1838 39.33
1839 40.91
1840 40.37
1841 40.68
1842 40.01
1843 40.75
1844 42.29
1845 43.58
1846 40.67
1847 40.41
1848 40.29
1849 35.91
1850 43.28
1851 41.77
1852 41.32
1853 42.52
1854 36.13
1855 37.54
1856 40.18
1857 39.59
1858 39.67
1859 35.26
1860 43.33
1861 40.45
1862 42.7
1863 41.73
1864 42.01
1865 40.16
1866 41.83
1867 42.33
1868 40.23
1869 41.14
1870 36.41
1871 29.59
1872 42.64
1873 41.76
1874 44.31
1875 43.18
1876 43.56
1877 44.34
1878 43.37
1879 44.01
1880 42.75
1881 43.57
1882 43.18
1883 43.3
1884 42.55
1885 44
1886 43.2
1887 43.78
1888 44.18
1889 45.6
1890 43.4
1891 44.15
1892 43.61
1893 43.64
1894 45.58
1895 45.25
1896 47.61
1897 47.98
1898 46.04
1899 45.29
1900 45.14
1901 47.07
1902 48.08
1903 48.5
1904 48.15
1905 48.43
1906 47.81
1907 48.36
1908 49.38
1909 50.09
1910 51.46
1911 48.25
1912 51.71
1913 51.44
1914 37.92
1915 35.7
1916 39.59
1917 42.68
1918 34.41
1919 47.62
1920 51.71
1921 52.8
1922 55.04
1923 54.77
1924 55.4
1925 54.52
1926 54.16
1927 55.93
1928 55.58
1929 54.41
1930 57.01
1931 57.08
1932 57.41
1933 57.85
1934 58.52
1935 58.48
1936 58.97
1937 59.34
1938 59.14
1939 59.79
1940 49.6
1941 57.84
1942 57.62
1943 53.49
1944 47.34
1945 55.13
1946 62.58
1947 64.19
1948 66.05
1949 65.14
1950 66.61
1951 66.35
1952 67.64
1953 67.58
1954 68.45
1955 68.72
1956 68.75
1957 69.18
1958 70.42
1959 70.45
1960 70.67
1961 71.25
1962 70.78
1963 70.64
1964 71.6
1965 71.44
1966 71.85
1967 71.84
1968 71.84
1969 71.57
1970 72.47
1971 72.64
1972 72.85
1973 73.05
1974 73.22
1975 73.23
1976 73.54
1977 73.86
1978 74.13
1979 74.41
1980 74.59
1981 74.79
1982 75.04
1983 75.26
1984 75.59
1985 75.84
1986 76.08
1987 76.43
1988 76.69
1989 76.93
1990 77.16
1991 77.34
1992 77.56
1993 77.73
1994 77.94
1995 78.12
1996 78.32
1997 78.63
1998 78.74
1999 78.89
2000 79.09
2001 79.31
2002 79.54
2003 79.72
2004 80.09
2005 80.34
2006 80.6
2007 80.84
2008 81.02
2009 81.22
2010 81.42
2011 81.65
2012 81.77
2013 81.95
2014 82.16
2015 82.22
2016 82.29
2017 82.46
2018 82.62