Year Measure
1800 886.8
1801 886.8
1802 886.8
1803 886.8
1804 886.8
1805 886.8
1806 886.8
1807 886.8
1808 886.8
1809 886.8
1810 886.8
1811 886.8
1812 886.8
1813 886.8
1814 886.8
1815 886.8
1816 886.8
1817 886.8
1818 886.8
1819 886.8
1820 886.8
1821 886.6
1822 886.4
1823 886.2
1824 885.9
1825 885.7
1826 885.5
1827 885.3
1828 885.1
1829 884.8
1830 884.6
1831 884.4
1832 884.2
1833 884
1834 883.7
1835 883.5
1836 883.3
1837 883.1
1838 882.9
1839 882.6
1840 882.4
1841 882.2
1842 882
1843 881.8
1844 881.5
1845 881.3
1846 881.1
1847 880.9
1848 880.7
1849 880.4
1850 880.2
1851 880
1852 879.8
1853 879.6
1854 879.3
1855 879.1
1856 878.9
1857 878.7
1858 878.5
1859 878.2
1860 878
1861 877.8
1862 877.6
1863 877.4
1864 877.1
1865 876.9
1866 876.7
1867 876.5
1868 876.3
1869 876
1870 875.8
1871 875.6
1872 875.4
1873 875.2
1874 875
1875 874.7
1876 874.5
1877 874.3
1878 874.1
1879 873.9
1880 873.6
1881 873.4
1882 873.2
1883 873
1884 872.8
1885 872.6
1886 872.3
1887 872.1
1888 871.9
1889 871.7
1890 871.5
1891 871.2
1892 871
1893 870.8
1894 870.6
1895 870.4
1896 870.2
1897 869.9
1898 869.7
1899 869.5
1900 869.3
1901 869.1
1902 868.9
1903 868.6
1904 868.4
1905 868.2
1906 868
1907 867.8
1908 867.6
1909 867.3
1910 867.1
1911 866.9
1912 866.7
1913 866.5
1914 866.3
1915 866
1916 865.8
1917 865.6
1918 865.4
1919 865.2
1920 865
1921 864.7
1922 864.5
1923 864.3
1924 864.1
1925 863.9
1926 863.7
1927 863.5
1928 863.2
1929 863
1930 862.8
1931 862.6
1932 862.4
1933 862.2
1934 861.9
1935 861.7
1936 861.5
1937 861.3
1938 861.1
1939 860.9
1940 860.7
1941 860.4
1942 860.2
1943 860
1944 859.8
1945 859.6
1946 859.4
1947 859.2
1948 858.9
1949 858.7
1950 858.5
1951 877
1952 895.9
1953 915.1
1954 934.8
1955 955
1956 975.5
1957 996.5
1958 1018
1959 1040
1960 1062
1961 1085
1962 1108
1963 1132
1964 1157
1965 1182
1966 1207
1967 1233
1968 1260
1969 1287
1970 1314
1971 1351
1972 1351
1973 1339
1974 1381
1975 1238
1976 1212
1977 1311
1978 1462
1979 1572
1980 1810
1981 1965
1982 1851
1983 2089
1984 2573
1985 2818
1986 2984
1987 3145
1988 3309
1989 3501
1990 3944
1991 4119
1992 4249
1993 4385
1994 4554
1995 4759
1996 5065
1997 5533
1998 5935
1999 6284
2000 6450
2001 6552
2002 6845
2003 7363
2004 8071
2005 7546
2006 8866
2007 9612
2008 10620
2009 10070
2010 10600
2011 11160
2012 11070
2013 11290
2014 11570
2015 11890
2016 12240
2017 12600
2018 12980
2019 13370