Year Measure
1820 1865
1821 1879
1822 1894
1823 1908
1824 1923
1825 1937
1826 1952
1827 1967
1828 1982
1829 1998
1830 2013
1831 2028
1832 2044
1833 2060
1834 2075
1835 2091
1836 2107
1837 2123
1838 2140
1839 2156
1840 2173
1841 2189
1842 2206
1843 2223
1844 2240
1845 2257
1846 2275
1847 2292
1848 2310
1849 2327
1850 2345
1851 2363
1852 2381
1853 2400
1854 2418
1855 2436
1856 2455
1857 2474
1858 2493
1859 2512
1860 2531
1861 2551
1862 2570
1863 2590
1864 2610
1865 2630
1866 2650
1867 2670
1868 2691
1869 2711
1870 2732
1871 2773
1872 2815
1873 2858
1874 2901
1875 2945
1876 2989
1877 3034
1878 3080
1879 3126
1880 3173
1881 3221
1882 3270
1883 3319
1884 3369
1885 3420
1886 3472
1887 3524
1888 3577
1889 3631
1890 3686
1891 3735
1892 3785
1893 3836
1894 3887
1895 3940
1896 3992
1897 4046
1898 4100
1899 4155
1900 4211
1901 4284
1902 4359
1903 4435
1904 4513
1905 4592
1906 4672
1907 4754
1908 4837
1909 4921
1910 5007
1911 5087
1912 5168
1913 5251
1914 5099
1915 4952
1916 4809
1917 4670
1918 4535
1919 4404
1920 4277
1921 4399
1922 4524
1923 4653
1924 4786
1925 5705
1926 5412
1927 5600
1928 6045
1929 6197
1930 6016
1931 5677
1932 5487
1933 5942
1934 5931
1935 6185
1936 6553
1937 6365
1938 6646
1939 7103
1940 6574
1941 6573
1942 6866
1943 6110
1944 5438
1945 4840
1946 4307
1947 4439
1948 5507
1949 5893
1950 6207
1951 6746
1952 6913
1953 6972
1954 7134
1955 7685
1956 7273
1957 7933
1958 8428
1959 8721
1960 9134
1961 9552
1962 9917
1963 10430
1964 10980
1965 11040
1966 11630
1967 12250
1968 12350
1969 12670
1970 12580
1971 13110
1972 13360
1973 14010
1974 14310
1975 14530
1976 14490
1977 15330
1978 15650
1979 15650
1980 15790
1981 15900
1982 16480
1983 16330
1984 16790
1985 16410
1986 16770
1987 17060
1988 17600
1989 17280
1990 16170
1991 14250
1992 13840
1993 13780
1994 14210
1995 14450
1996 14670
1997 15380
1998 16180
1999 16910
2000 17850
2001 18630
2002 19500
2003 20370
2004 21400
2005 22350
2006 23260
2007 23320
2008 23540
2009 21990
2010 22310
2011 22740
2012 22480
2013 22850
2014 23350
2015 23810
2016 24250
2017 24720
2018 25200
2019 25690