Year Measure
1800 1160
1820 1312
1830 1451
1840 1686
1850 1929
1860 2105
1870 2459
1871 2546
1872 2475
1873 2673
1874 2690
1875 2589
1876 2381
1877 2507
1878 2376
1879 2562
1880 2635
1881 2960
1882 3061
1883 3034
1884 3237
1885 3008
1886 3012
1887 3076
1888 3264
1889 3250
1890 3451
1891 3496
1892 3441
1893 3387
1894 3513
1895 3441
1896 3321
1897 3645
1898 3749
1899 4057
1900 4225
1901 4494
1902 4834
1903 4838
1904 4759
1905 5169
1906 5582
1907 5623
1908 5184
1909 5586
1910 5900
1911 6113
1912 6352
1913 6453
1914 5841
1915 6143
1916 6742
1917 6967
1918 6444
1919 5833
1920 5604
1921 4872
1922 5505
1923 5770
1924 5771
1925 6299
1926 6526
1927 7034
1928 7505
1929 7351
1930 6981
1931 5810
1932 5328
1933 4891
1934 5356
1935 5733
1936 5985
1937 6492
1938 6597
1939 6919
1940 7790
1941 8781
1942 10210
1943 10540
1944 10800
1945 10350
1946 10060
1947 10290
1948 10250
1949 10250
1950 10580
1951 10930
1952 11370
1953 11590
1954 11170
1955 11900
1956 12560
1957 12490
1958 12380
1959 12590
1960 12700
1961 12820
1962 13460
1963 13880
1964 14510
1965 15200
1966 15880
1967 16080
1968 16660
1969 17290
1970 17490
1971 18230
1972 18970
1973 20080
1974 20610
1975 20780
1976 21630
1977 22090
1978 22750
1979 23470
1980 23470
1981 23900
1982 22900
1983 23330
1984 24430
1985 25510
1986 25920
1987 26630
1988 27560
1989 27730
1990 27390
1991 26490
1992 26340
1993 26590
1994 27540
1995 27970
1996 28070
1997 28950
1998 29840
1999 31150
2000 32450
2001 32570
2002 33330
2003 33640
2004 34350
2005 35080
2006 35640
2007 36000
2008 35980
2009 34550
2010 35220
2011 35740
2012 35990
2013 36120
2014 36640
2015 37220
2016 37790
2017 38340
2018 38830