Year	Measure
1820	975.1
1821	985.6
1822	996.2
1823	1007
1824	1018
1825	1029
1826	1040
1827	1051
1828	1062
1829	1074
1830	1085
1831	1097
1832	1109
1833	1121
1834	1133
1835	1145
1836	1157
1837	1170
1838	1182
1839	1195
1840	1208
1841	1221
1842	1234
1843	1247
1844	1261
1845	1275
1846	1288
1847	1302
1848	1316
1849	1330
1850	1345
1851	1359
1852	1374
1853	1389
1854	1403
1855	1419
1856	1434
1857	1449
1858	1465
1859	1481
1860	1497
1861	1513
1862	1529
1863	1546
1864	1562
1865	1579
1866	1596
1867	1613
1868	1631
1869	1648
1870	1666
1871	1695
1872	1689
1873	1766
1874	1819
1875	1811
1876	1782
1877	1820
1878	1887
1879	1998
1880	2116
1881	2121
1882	1893
1883	1820
1884	1842
1885	1881
1886	1887
1887	1856
1888	1920
1889	2002
1890	2086
1891	2136
1892	2273
1893	2420
1894	2447
1895	2394
1896	2441
1897	2426
1898	2353
1899	2350
1900	2440
1901	2545
1902	2615
1903	2615
1904	2618
1905	2797
1906	2859
1907	2970
1908	2946
1909	2913
1910	3119
1911	3251
1912	3274
1913	3421
1914	3345
1915	3282
1916	2893
1917	2831
1918	2664
1919	3084
1920	2600
1921	2858
1922	3206
1923	3031
1924	3230
1925	3222
1926	3468
1927	3807
1928	3952
1929	4179
1930	4618
1931	4546
1932	4339
1933	4784
1934	4817
1935	4639
1936	4628
1937	4803
1938	4803
1939	5338
1940	5615
1941	6365
1942	7338
1943	7734
1944	8366
1945	8896
1946	9127
1947	9918
1948	9927
1949	9547
1950	9117
1951	8786
1952	8549
1953	9659
1954	10350
1955	11130
1956	11160
1957	10870
1958	11520
1959	11490
1960	11630
1961	11440
1962	12170
1963	13200
1964	14270
1965	15050
1966	16120
1967	15670
1968	14630
1969	14890
1970	15920
1971	17800
1972	18580
1973	19610
1974	20440
1975	20350
1976	21380
1977	23120
1978	24290
1979	25240
1980	26390
1981	27200
1982	27370
1983	26470
1984	27310
1985	28020
1986	29530
1987	31670
1988	31100
1989	30960
1990	31020
1991	30980
1992	29580
1993	29440
1994	30520
1995	30400
1996	31790
1997	33010
1998	34410
1999	35340
2000	36570
2001	37440
2002	36660
2003	37570
2004	40320
2005	41910
2006	42780
2007	44510
2008	44610
2009	41280
2010	39190
2011	39910
2012	40330
2013	41190
2014	42140
2015	43250
2016	44320
2017	45400
2018	46240
2019	47110