Year Measure
1800 453.6
1820 453.6
1850 465.1
1870 702.3
1871 682.2
1872 647.3
1873 650.3
1874 639.1
1875 643.9
1876 650.6
1877 654.2
1878 592
1879 634.8
1880 685.1
1881 731.4
1882 771.5
1883 776.6
1884 746.2
1885 694.8
1886 668.4
1887 779.6
1888 759.9
1889 743.7
1890 862.2
1891 855.2
1892 867.9
1893 868.2
1894 860.6
1895 895
1896 897.5
1897 928
1898 963.3
1899 1018
1900 1064
1901 983.1
1902 969.6
1903 1011
1904 1002
1905 972.5
1906 982
1907 1017
1908 1007
1909 951
1910 996.5
1911 957
1912 954.1
1913 1018
1914 998
1915 937.4
1916 967.3
1917 1004
1918 913.5
1919 962.2
1920 900.8
1921 873.6
1922 896.2
1923 879
1924 930.2
1925 979.1
1926 1045
1927 1041
1928 1037
1929 1102
1930 1044
1931 992.2
1932 941.2
1933 948.7
1934 1039
1935 976.7
1936 969
1937 1028
1938 1011
1939 978.5
1940 1032
1941 1053
1942 1091
1943 1059
1944 952.3
1945 920.4
1946 866.4
1947 885.5
1948 956.2
1949 989.1
1950 1033
1951 1067
1952 1084
1953 1072
1954 1071
1955 1105
1956 1084
1957 1073
1958 1076
1959 1063
1960 1072
1961 1065
1962 1074
1963 1070
1964 1094
1965 1102
1966 1065
1967 1136
1968 1192
1969 1213
1970 1245
1971 1211
1972 1213
1973 1241
1974 1262
1975 1271
1976 1287
1977 1349
1978 1408
1979 1471
1980 1525
1981 1595
1982 1648
1983 1709
1984 1771
1985 1822
1986 1886
1987 1877
1988 1899
1989 1922
1990 2019
1991 2088
1992 2154
1993 2272
1994 2366
1995 2465
1996 2530
1997 2664
1998 2762
1999 2854
2000 2998
2001 2926
2002 3015
2003 3167
2004 3310
2005 3481
2006 3719
2007 3941
2008 4143
2009 4256
2010 4561
2011 4904
2012 5183
2013 5469
2014 5799
2015 6134
2016 6488
2017 6863
2018 7260