Year Measure
1820 440.1
1821 442.2
1822 444.3
1823 446.3
1824 448.4
1825 450.5
1826 452.7
1827 454.8
1828 456.9
1829 459.1
1830 461.2
1831 463.4
1832 465.5
1833 467.7
1834 469.9
1835 472.1
1836 474.3
1837 476.6
1838 478.8
1839 481
1840 483.3
1841 485.6
1842 487.8
1843 490.1
1844 492.4
1845 494.7
1846 497.1
1847 499.4
1848 501.7
1849 504.1
1850 506.4
1851 508.8
1852 511.2
1853 513.6
1854 516
1855 518.4
1856 520.9
1857 523.3
1858 525.8
1859 528.2
1860 530.7
1861 533.2
1862 535.7
1863 538.2
1864 540.7
1865 543.3
1866 545.8
1867 548.4
1868 550.9
1869 553.5
1870 556.1
1871 558.7
1872 561.3
1873 564
1874 566.6
1875 569.3
1876 571.9
1877 574.6
1878 577.3
1879 580
1880 582.7
1881 585.5
1882 588.2
1883 591
1884 593.8
1885 596.5
1886 599.3
1887 602.1
1888 605
1889 607.8
1890 610.7
1891 613.5
1892 616.4
1893 619.3
1894 622.2
1895 625.1
1896 628
1897 631
1898 633.9
1899 636.9
1900 639.9
1901 642.9
1902 645.9
1903 648.9
1904 652
1905 655
1906 658.1
1907 661.2
1908 664.3
1909 667.4
1910 670.5
1911 673.7
1912 676.9
1913 680
1914 691.1
1915 702.4
1916 713.9
1917 725.6
1918 737.4
1919 749.5
1920 761.7
1921 774.2
1922 786.8
1923 799.7
1924 812.8
1925 826.1
1926 839.6
1927 853.3
1928 867.2
1929 881.4
1930 895.8
1931 910.4
1932 925.3
1933 940.4
1934 955.8
1935 971.4
1936 987.3
1937 1003
1938 1020
1939 1037
1940 1053
1941 1071
1942 1088
1943 1106
1944 1124
1945 1142
1946 1161
1947 1180
1948 1199
1949 1219
1950 1239
1951 1267
1952 1295
1953 1322
1954 1350
1955 1379
1956 1408
1957 1437
1958 1467
1959 1495
1960 1482
1961 1476
1962 1527
1963 1477
1964 1412
1965 1389
1966 1335
1967 1315
1968 1281
1969 1339
1970 1335
1971 1331
1972 1213
1973 1127
1974 1253
1975 1434
1976 1379
1977 1246
1978 1209
1979 940
1980 883.9
1981 873
1982 876.4
1983 974.2
1984 984.5
1985 1190
1986 1110
1987 1046
1988 1171
1989 1206
1990 1097
1991 1171
1992 1162
1993 1102
1994 1124
1995 1094
1996 1093
1997 1104
1998 1152
1999 1142
2000 1117
2001 1191
2002 1270
2003 1414
2004 1834
2005 1921
2006 1877
2007 1835
2008 1820
2009 1754
2010 1933
2011 1896
2012 2014
2013 2036
2014 2201
2015 2305
2016 2354
2017 2373
2018 2391
2019 2415