Year Years
1800 30.28
1801 30.28
1802 30.28
1803 30.28
1804 30.28
1805 30.28
1806 30.28
1807 30.28
1808 30.28
1809 30.28
1810 30.28
1811 30.28
1812 30.28
1813 30.28
1814 30.28
1815 30.28
1816 30.28
1817 30.28
1818 30.28
1819 30.28
1820 30.28
1821 30.28
1822 30.28
1823 30.28
1824 30.28
1825 30.28
1826 30.28
1827 30.28
1828 30.28
1829 30.28
1830 30.28
1831 30.28
1832 30.28
1833 30.28
1834 30.28
1835 30.28
1836 30.28
1837 30.28
1838 30.28
1839 30.28
1840 30.28
1841 30.28
1842 30.28
1843 30.28
1844 30.28
1845 30.28
1846 30.28
1847 30.28
1848 30.28
1849 30.28
1850 30.28
1851 30.28
1852 30.28
1853 30.28
1854 30.28
1855 30.28
1856 30.28
1857 30.28
1858 30.28
1859 30.28
1860 30.28
1861 30.28
1862 30.28
1863 30.28
1864 30.28
1865 30.28
1866 30.28
1867 30.28
1868 30.28
1869 30.28
1870 30.28
1871 30.34
1872 30.41
1873 30.47
1874 30.54
1875 30.6
1876 30.66
1877 30.73
1878 30.79
1879 30.86
1880 30.92
1881 30.99
1882 31.05
1883 31.11
1884 31.18
1885 31.24
1886 31.31
1887 31.37
1888 31.43
1889 31.5
1890 31.56
1891 31.63
1892 31.69
1893 31.75
1894 31.82
1895 31.88
1896 31.95
1897 32.01
1898 32.07
1899 32.14
1900 32.2
1901 32.27
1902 32.33
1903 32.4
1904 32.46
1905 32.52
1906 32.59
1907 32.65
1908 32.72
1909 32.78
1910 32.84
1911 32.91
1912 32.97
1913 33.04
1914 33.1
1915 33.16
1916 33.23
1917 33.29
1918 12.9
1919 33.42
1920 33.49
1921 33.55
1922 33.61
1923 33.68
1924 33.74
1925 33.81
1926 33.87
1927 33.93
1928 34
1929 34.06
1930 34.13
1931 34.19
1932 34.25
1933 34.32
1934 34.38
1935 34.45
1936 34.51
1937 34.58
1938 34.64
1939 34.7
1940 34.77
1941 34.83
1942 34.9
1943 34.96
1944 35.02
1945 35.09
1946 35.15
1947 35.22
1948 35.28
1949 35.34
1950 35.41
1951 35.77
1952 36.42
1953 37.08
1954 37.75
1955 38.41
1956 39.08
1957 39.74
1958 40.41
1959 41.06
1960 41.7
1961 42.33
1962 42.94
1963 43.52
1964 44.09
1965 44.65
1966 45.21
1967 45.77
1968 46.34
1969 46.94
1970 47.56
1971 47.82
1972 48.12
1973 48.43
1974 48.86
1975 49.51
1976 49.69
1977 49.75
1978 49.96
1979 50.04
1980 50.26
1981 47.64
1982 47.8
1983 47.81
1984 45.2
1985 45.11
1986 47
1987 47.16
1988 50.25
1989 50.57
1990 50.66
1991 50.81
1992 50.93
1993 51.01
1994 51.21
1995 51.23
1996 51.24
1997 51.18
1998 51.32
1999 51.4
2000 51.32
2001 51.78
2002 51.84
2003 52.09
2004 52.27
2005 52.35
2006 52.61
2007 52.92
2008 53.62
2009 54.08
2010 54.48
2011 55.05
2012 55.63
2013 56.51
2014 57.9
2015 58.96
2016 59.97
2017 60.54
2018 61.07