Year	Measure
1800	1464
1801	1470
1802	1475
1803	1481
1804	1486
1805	1491
1806	1497
1807	1502
1808	1508
1809	1513
1810	1519
1811	1525
1812	1530
1813	1536
1814	1541
1815	1547
1816	1553
1817	1559
1818	1564
1819	1570
1820	1576
1821	1582
1822	1587
1823	1593
1824	1599
1825	1605
1826	1611
1827	1617
1828	1623
1829	1629
1830	1635
1831	1641
1832	1647
1833	1653
1834	1659
1835	1665
1836	1671
1837	1677
1838	1683
1839	1689
1840	1696
1841	1702
1842	1708
1843	1714
1844	1721
1845	1727
1846	1733
1847	1740
1848	1746
1849	1753
1850	1759
1851	1765
1852	1772
1853	1778
1854	1785
1855	1792
1856	1798
1857	1805
1858	1811
1859	1818
1860	1825
1861	1831
1862	1838
1863	1845
1864	1852
1865	1858
1866	1865
1867	1872
1868	1879
1869	1886
1870	1893
1871	1922
1872	1952
1873	1982
1874	2012
1875	2043
1876	2074
1877	2106
1878	2139
1879	2172
1880	2205
1881	2239
1882	2274
1883	2309
1884	2344
1885	2380
1886	2417
1887	2454
1888	2492
1889	2530
1890	2569
1891	2616
1892	2663
1893	2711
1894	2760
1895	2810
1896	2861
1897	2913
1898	2965
1899	3019
1900	3073
1901	3103
1902	3133
1903	3163
1904	3193
1905	3224
1906	3255
1907	3286
1908	3317
1909	3349
1910	3381
1911	3414
1912	3447
1913	3480
1914	3523
1915	3566
1916	3610
1917	3655
1918	3700
1919	3746
1920	3792
1921	3839
1922	3887
1923	3935
1924	3984
1925	4033
1926	4083
1927	4134
1928	4185
1929	4237
1930	3990
1931	3648
1932	3317
1933	3181
1934	3188
1935	3195
1936	3251
1937	3833
1938	4367
1939	4695
1940	3974
1941	3621
1942	3184
1943	2994
1944	1924
1945	1989
1946	3389
1947	3921
1948	4353
1949	4684
1950	4896
1951	5023
1952	5045
1953	5238
1954	5432
1955	5590
1956	5730
1957	5927
1958	6117
1959	6195
1960	6432
1961	6855
1962	6684
1963	7008
1964	7247
1965	7577
1966	7986
1967	8209
1968	8639
1969	8486
1970	8860
1971	9418
1972	10020
1973	10680
1974	11210
1975	11620
1976	11800
1977	11900
1978	12230
1979	11890
1980	11480
1981	10780
1982	10580
1983	11000
1984	11310
1985	11330
1986	11600
1987	11370
1988	11580
1989	11370
1990	10230
1991	9480
1992	9689
1993	10030
1994	10530
1995	11250
1996	11920
1997	12720
1998	13420
1999	14030
2000	14620
2001	14810
2002	15030
2003	15620
2004	16460
2005	16990
2006	18060
2007	19300
2008	20300
2009	20610
2010	21400
2011	22110
2012	22530
2013	22890
2014	23590
2015	24370
2016	25190
2017	26080
2018	27030
2019	28020
