Year	Measure
1800	920
1801	920
1802	920
1803	920
1804	920
1805	920
1806	920
1807	920
1808	920
1809	920
1810	920
1811	920
1812	920
1813	920
1814	920
1815	920
1816	920
1817	920
1818	920
1819	920
1820	920
1821	921.5
1822	922.9
1823	924.4
1824	925.9
1825	927.4
1826	928.9
1827	930.3
1828	931.8
1829	933.3
1830	934.8
1831	936.3
1832	937.8
1833	939.3
1834	940.8
1835	942.3
1836	943.8
1837	945.3
1838	946.8
1839	948.3
1840	949.9
1841	951.4
1842	952.9
1843	954.4
1844	955.9
1845	957.5
1846	959
1847	960.5
1848	962.1
1849	963.6
1850	965.1
1851	966.7
1852	968.2
1853	969.8
1854	971.3
1855	972.9
1856	974.4
1857	976
1858	977.5
1859	979.1
1860	980.7
1861	982.2
1862	983.8
1863	985.4
1864	987
1865	988.5
1866	990.1
1867	991.7
1868	993.3
1869	994.9
1870	996.5
1871	998
1872	999.6
1873	1001
1874	1003
1875	1004
1876	1006
1877	1008
1878	1009
1879	1011
1880	1012
1881	1014
1882	1016
1883	1017
1884	1019
1885	1021
1886	1022
1887	1024
1888	1026
1889	1027
1890	1029
1891	1030
1892	1032
1893	1034
1894	1035
1895	1037
1896	1039
1897	1040
1898	1042
1899	1044
1900	1045
1901	1047
1902	1049
1903	1050
1904	1052
1905	1054
1906	1055
1907	1057
1908	1059
1909	1060
1910	1062
1911	1064
1912	1066
1913	1067
1914	1088
1915	1109
1916	1131
1917	1153
1918	1176
1919	1199
1920	1222
1921	1246
1922	1271
1923	1296
1924	1321
1925	1347
1926	1373
1927	1400
1928	1428
1929	1455
1930	1484
1931	1513
1932	1543
1933	1573
1934	1604
1935	1635
1936	1667
1937	1700
1938	1733
1939	1767
1940	1802
1941	1837
1942	1873
1943	1909
1944	1947
1945	1985
1946	2024
1947	2063
1948	2104
1949	2145
1950	2187
1951	2191
1952	2194
1953	2207
1954	2218
1955	2229
1956	2181
1957	2134
1958	2087
1959	2041
1960	1997
1961	2016
1962	2035
1963	2055
1964	2075
1965	2095
1966	2158
1967	2223
1968	2290
1969	2359
1970	2429
1971	2501
1972	2508
1973	2546
1974	2631
1975	2751
1976	2994
1977	3080
1978	3109
1979	3189
1980	3414
1981	3260
1982	3512
1983	3400
1984	3450
1985	3572
1986	3755
1987	3580
1988	3851
1989	3847
1990	3901
1991	4119
1992	3930
1993	3825
1994	4197
1995	3870
1996	4325
1997	4177
1998	4448
1999	4414
2000	4430
2001	4710
2002	4815
2003	5067
2004	5259
2005	5363
2006	5725
2007	5825
2008	6091
2009	6313
2010	6466
2011	6698
2012	6807
2013	7045
2014	7248
2015	7529
2016	7843
2017	8187
2018	8566
2019	8962