Year Years
1800 29.7
1801 29.7
1802 29.7
1803 29.7
1804 29.7
1805 29.7
1806 29.7
1807 29.7
1808 29.7
1809 29.7
1810 29.7
1811 29.7
1812 29.7
1813 29.7
1814 29.7
1815 29.7
1816 29.7
1817 29.7
1818 29.7
1819 29.7
1820 29.7
1821 29.7
1822 29.7
1823 29.7
1824 29.7
1825 29.7
1826 29.7
1827 29.7
1828 28
1829 27
1830 26
1831 27
1832 29.7
1833 29.7
1834 29.7
1835 28
1836 27
1837 26
1838 27
1839 29.7
1840 29.7
1841 29.7
1842 29.7
1843 29.7
1844 29.7
1845 29.7
1846 29.7
1847 29.7
1848 29.7
1849 29.7
1850 29.7
1851 29.7
1852 29.7
1853 29.7
1854 29.7
1855 29.7
1856 29.7
1857 29.7
1858 29.7
1859 29.7
1860 29.7
1861 29.7
1862 29.7
1863 29.7
1864 26
1865 25
1866 24
1867 29.7
1868 29.7
1869 29.7
1870 29.7
1871 29.71
1872 29.71
1873 29.72
1874 29.72
1875 29.73
1876 29.73
1877 29.74
1878 29.74
1879 29.75
1880 27.05
1881 26.05
1882 29.76
1883 29.77
1884 29.77
1885 29.78
1886 29.79
1887 29.79
1888 17.06
1889 5.02
1890 4.01
1891 8.03
1892 14.06
1893 29.82
1894 29.83
1895 29.63
1896 28.83
1897 29.84
1898 29.85
1899 29.86
1900 29.86
1901 29.87
1902 29.87
1903 29.88
1904 29.88
1905 29.89
1906 29.89
1907 29.9
1908 29.9
1909 29.91
1910 29.91
1911 29.92
1912 29.92
1913 29.93
1914 29.94
1915 29.94
1916 29.95
1917 29.95
1918 11.59
1919 29.96
1920 29.97
1921 29.97
1922 29.98
1923 29.98
1924 29.99
1925 29.99
1926 30
1927 30
1928 30.01
1929 30.02
1930 30.02
1931 30.03
1932 30.03
1933 30.04
1934 30.04
1935 27.82
1936 23.27
1937 29.35
1938 29.36
1939 29.36
1940 28.35
1941 28.36
1942 30.09
1943 30.09
1944 30.1
1945 30.1
1946 30.84
1947 31.57
1948 32.31
1949 33.04
1950 33.78
1951 33.96
1952 34.33
1953 34.76
1954 35.25
1955 35.78
1956 36.36
1957 33.52
1958 31.49
1959 38.34
1960 39.04
1961 39.72
1962 40.37
1963 40.96
1964 40.88
1965 39.67
1966 40.69
1967 42.76
1968 43.11
1969 43.42
1970 43.72
1971 43.81
1972 43.98
1973 43.53
1974 43.51
1975 43.64
1976 43.45
1977 43.52
1978 43.57
1979 44.46
1980 44.62
1981 44.79
1982 45.04
1983 40.91
1984 41.35
1985 45.88
1986 46.44
1987 46.99
1988 47.34
1989 47.07
1990 46.63
1991 48.22
1992 48.92
1993 49.33
1994 49.63
1995 49.89
1996 50.55
1997 51.04
1998 51.49
1999 51.11
2000 51.14
2001 53.11
2002 53.89
2003 54.55
2004 55.33
2005 56.11
2006 57.06
2007 58.2
2008 59.39
2009 60.4
2010 61.3
2011 62.24
2012 63.08
2013 63.87
2014 64.64
2015 65.15
2016 65.64
2017 66.04
2018 66.42