Year Total
1800 5.11
1801 5.11
1802 5.11
1803 5.11
1804 5.11
1805 5.11
1806 5.11
1807 5.11
1808 5.11
1809 5.11
1810 5.11
1811 5.11
1812 5.11
1813 5.11
1814 5.11
1815 5.11
1816 5.11
1817 5.11
1818 5.11
1819 5.11
1820 5.11
1821 5.11
1822 5.11
1823 5.11
1824 5.11
1825 5.11
1826 5.11
1827 5.11
1828 5.11
1829 5.11
1830 5.11
1831 5.11
1832 5.11
1833 5.11
1834 5.11
1835 5.11
1836 5.11
1837 5.11
1838 5.11
1839 5.11
1840 5.11
1841 5.09
1842 5.06
1843 5.04
1844 5.02
1845 4.99
1846 4.99
1847 4.99
1848 4.99
1849 4.99
1850 4.89
1851 4.8
1852 4.7
1853 4.6
1854 4.6
1855 4.6
1856 4.6
1857 4.6
1858 4.6
1859 4.68
1860 4.75
1861 4.83
1862 4.9
1863 4.98
1864 4.99
1865 5.01
1866 5.02
1867 5.04
1868 5.05
1869 5.09
1870 5.12
1871 5.16
1872 5.19
1873 5.23
1874 5.27
1875 5.31
1876 5.34
1877 5.38
1878 5.42
1879 5.39
1880 5.35
1881 5.32
1882 5.28
1883 5.25
1884 5.23
1885 5.21
1886 5.18
1887 5.16
1888 5.14
1889 5.11
1890 5.07
1891 5.04
1892 5
1893 4.97
1894 4.93
1895 4.88
1896 4.84
1897 4.79
1898 4.75
1899 4.6
1900 4.45
1901 4.53
1902 4.46
1903 4.42
1904 4.38
1905 4.29
1906 4.23
1907 4.18
1908 4.13
1909 4.04
1910 3.94
1911 3.81
1912 3.84
1913 3.85
1914 3.86
1915 3.59
1916 3.64
1917 3.59
1918 3.47
1919 3.36
1920 3.89
1921 3.75
1922 3.54
1923 3.55
1924 3.39
1925 3.26
1926 3.18
1927 3.08
1928 3.09
1929 3
1930 3.03
1931 2.88
1932 2.83
1933 2.66
1934 2.63
1935 2.57
1936 2.51
1937 2.53
1938 2.63
1939 2.64
1940 2.67
1941 2.61
1942 2.71
1943 2.98
1944 3.13
1945 2.96
1946 3.97
1947 3.7
1948 3.41
1949 3.22
1950 3.1
1951 3.05
1952 3.09
1953 3.03
1954 3.03
1955 3.03
1956 3.05
1957 3.08
1958 3.11
1959 3.17
1960 3.12
1961 3.22
1962 3.18
1963 3.19
1964 3.17
1965 3.04
1966 2.9
1967 2.81
1968 2.72
1969 2.75
1970 2.57
1971 2.36
1972 2.15
1973 1.9
1974 1.77
1975 1.66
1976 1.63
1977 1.58
1978 1.58
1979 1.56
1980 1.6
1981 1.56
1982 1.5
1983 1.47
1984 1.49
1985 1.51
1986 1.55
1987 1.56
1988 1.55
1989 1.55
1990 1.62
1991 1.61
1992 1.59
1993 1.57
1994 1.57
1995 1.53
1996 1.53
1997 1.56
1998 1.63
1999 1.65
2000 1.72
2001 1.71
2002 1.73
2003 1.75
2004 1.73
2005 1.71
2006 1.72
2007 1.72
2008 1.77
2009 1.79
2010 1.8
2011 1.76
2012 1.76
2013 1.77
2014 1.76
2015 1.75
2016 1.74
2017 1.75
2018 1.75