Year	Number of
1800	1955
1801	1955
1802	1955
1803	1955
1804	1955
1805	1955
1806	1955
1807	1955
1808	1955
1809	1955
1810	1955
1811	1956
1812	1957
1813	1960
1814	1963
1815	1967
1816	1972
1817	1978
1818	1985
1819	1993
1820	2001
1821	2011
1822	2021
1823	2032
1824	2045
1825	2058
1826	2072
1827	2087
1828	2103
1829	2120
1830	2138
1831	2157
1832	2176
1833	2195
1834	2215
1835	2234
1836	2254
1837	2274
1838	2294
1839	2315
1840	2335
1841	2356
1842	2377
1843	2398
1844	2419
1845	2441
1846	2462
1847	2484
1848	2506
1849	2528
1850	2551
1851	2557
1852	2563
1853	2569
1854	2572
1855	2578
1856	2583
1857	2589
1858	2595
1859	2601
1860	2602
1861	2607
1862	2613
1863	2635
1864	2654
1865	2677
1866	2696
1867	2719
1868	2743
1869	2762
1870	2786
1871	2806
1872	2831
1873	2850
1874	2874
1875	2900
1876	2920
1877	2945
1878	2965
1879	2991
1880	3017
1881	3038
1882	3064
1883	3086
1884	3112
1885	3134
1886	3161
1887	3188
1888	3211
1889	3239
1890	3261
1891	3290
1892	3318
1893	3342
1894	3371
1895	3394
1896	3423
1897	3446
1898	3475
1899	3503
1900	3525
1901	3553
1902	3574
1903	3601
1904	3627
1905	3647
1906	3673
1907	3691
1908	3716
1909	3734
1910	3758
1911	3762
1912	3766
1913	3777
1914	3780
1915	3784
1916	3788
1917	3791
1918	3802
1919	3806
1920	3809
1921	3716
1922	3624
1923	3539
1924	3450
1925	3361
1926	3273
1927	3198
1928	3118
1929	3033
1930	2965
1931	2896
1932	2827
1933	2759
1934	2691
1935	2623
1936	2556
1937	2488
1938	2421
1939	2354
1940	2287
1941	2230
1942	2164
1943	2098
1944	2032
1945	1966
1946	1901
1947	1837
1948	1773
1949	1709
1950	1646
1951	1650
1952	1653
1953	1651
1954	1634
1955	1612
1956	1567
1957	1526
1958	1461
1959	1401
1960	1327
1961	1248
1962	1165
1963	1084
1964	1002
1965	920
1966	841
1967	773
1968	708
1969	650
1970	599
1971	560
1972	525
1973	498
1974	473
1975	447
1976	423
1977	403
1978	385
1979	370
1980	329
1981	325
1982	320
1983	312
1984	309
1985	284
1986	257
1987	228
1988	201
1989	179
1990	163
1991	154
1992	148
1993	145
1994	144
1995	141
1996	138
1997	133
1998	127
1999	121
2000	115
2001	108
2002	103
2003	97
2004	91
2005	86
2006	79
2007	74
2008	67
2009	61
2010	56
2011	50
2012	44
2013	39
2014	36
2015	33