Year	Measure
1800	1251
1801	1251
1802	1251
1803	1251
1804	1251
1805	1251
1806	1251
1807	1251
1808	1251
1809	1251
1810	1251
1811	1251
1812	1251
1813	1251
1814	1251
1815	1251
1816	1251
1817	1251
1818	1251
1819	1251
1820	1251
1821	1253
1822	1256
1823	1258
1824	1260
1825	1262
1826	1264
1827	1267
1828	1269
1829	1271
1830	1273
1831	1275
1832	1278
1833	1280
1834	1282
1835	1284
1836	1287
1837	1289
1838	1291
1839	1293
1840	1296
1841	1298
1842	1300
1843	1302
1844	1305
1845	1307
1846	1309
1847	1311
1848	1314
1849	1316
1850	1318
1851	1321
1852	1323
1853	1325
1854	1327
1855	1330
1856	1332
1857	1334
1858	1337
1859	1339
1860	1341
1861	1344
1862	1346
1863	1348
1864	1351
1865	1353
1866	1355
1867	1358
1868	1360
1869	1363
1870	1365
1871	1374
1872	1383
1873	1393
1874	1402
1875	1411
1876	1421
1877	1430
1878	1440
1879	1450
1880	1459
1881	1469
1882	1479
1883	1489
1884	1499
1885	1509
1886	1519
1887	1529
1888	1540
1889	1550
1890	1560
1891	1571
1892	1581
1893	1592
1894	1603
1895	1613
1896	1624
1897	1635
1898	1646
1899	1657
1900	1668
1901	1680
1902	1691
1903	1702
1904	1714
1905	1725
1906	1737
1907	1748
1908	1760
1909	1772
1910	1784
1911	1796
1912	1808
1913	1820
1914	1858
1915	1897
1916	1936
1917	1977
1918	2018
1919	2060
1920	2104
1921	2147
1922	2192
1923	2238
1924	2285
1925	2333
1926	2382
1927	2431
1928	2482
1929	2534
1930	2587
1931	2641
1932	2696
1933	2753
1934	2810
1935	2869
1936	2929
1937	2990
1938	3053
1939	3116
1940	3182
1941	3248
1942	3316
1943	3385
1944	3456
1945	3528
1946	3602
1947	3677
1948	3754
1949	3833
1950	3913
1951	3808
1952	3707
1953	3612
1954	3517
1955	3423
1956	3627
1957	4021
1958	4364
1959	4605
1960	4907
1961	5171
1962	5120
1963	5520
1964	5748
1965	6265
1966	6689
1967	7228
1968	8078
1969	8868
1970	9531
1971	10430
1972	11800
1973	12460
1974	12920
1975	13230
1976	15000
1977	14370
1978	12360
1979	10990
1980	9229
1981	8609
1982	9497
1983	10310
1984	9950
1985	9728
1986	8502
1987	8185
1988	7547
1989	7642
1990	8286
1991	8990
1992	9402
1993	9100
1994	9151
1995	9292
1996	9709
1997	9916
1998	10040
1999	10260
2000	10430
2001	10560
2002	11250
2003	12000
2004	12460
2005	12960
2006	13600
2007	14550
2008	14630
2009	15030
2010	15700
2011	15970
2012	14880
2013	14450
2014	14480
2015	14630
2016	14780
2017	14930
2018	15080
2019	15240