Year Measure
1800 784.5
1820 784.5
1870 2515
1871 2512
1872 3036
1873 3000
1874 2670
1875 2240
1876 2427
1877 2448
1878 2592
1879 2248
1880 2401
1881 2228
1882 2399
1883 2764
1884 2681
1885 2963
1886 3008
1887 2615
1888 3135
1889 2786
1890 2477
1891 2642
1892 2646
1893 2811
1894 3065
1895 2962
1896 3050
1897 2876
1898 2595
1899 2608
1900 2559
1901 2576
1902 2967
1903 3016
1904 3045
1905 2692
1906 2922
1907 3180
1908 3429
1909 3410
1910 3617
1911 3410
1912 4046
1913 3818
1914 3061
1915 2849
1916 2893
1917 3134
1918 3261
1919 3616
1920 3084
1921 3173
1922 3550
1923 3656
1924 3918
1925 3677
1926 3919
1927 4380
1928 4505
1929 4438
1930 4961
1931 4037
1932 3686
1933 3172
1934 3715
1935 3870
1936 3989
1937 3993
1938 4240
1939 4258
1940 4222
1941 4247
1942 3850
1943 3842
1944 4273
1945 4341
1946 4709
1947 4974
1948 5081
1949 5194
1950 5374
1951 5715
1952 5717
1953 5927
1954 6218
1955 6172
1956 6182
1957 6151
1958 6231
1959 5605
1960 5721
1961 5809
1962 5603
1963 5559
1964 5603
1965 5605
1966 5737
1967 5445
1968 5475
1969 5756
1970 5979
1971 5917
1972 5703
1973 5737
1974 5909
1975 6253
1976 6469
1977 6504
1978 6809
1979 7190
1980 7586
1981 7691
1982 6920
1983 6475
1984 6366
1985 6420
1986 6947
1987 7452
1988 7407
1989 7453
1990 7466
1991 7629
1992 8137
1993 8332
1994 8728
1995 8495
1996 8857
1997 9230
1998 9590
1999 9267
2000 9092
2001 8732
2002 7727
2003 7854
2004 8735
2005 9266
2006 9620
2007 10220
2008 10920
2009 11150
2010 12100
2011 12740
2012 13180
2013 13630
2014 14130
2015 14650
2016 15180
2017 15730
2018 16300