Year Number of
1800 17860
1801 17860
1802 17860
1803 17860
1804 17860
1805 17860
1806 17860
1807 17860
1808 17860
1809 17860
1810 17860
1811 17870
1812 17880
1813 17900
1814 17930
1815 17960
1816 18000
1817 18050
1818 18110
1819 18170
1820 18240
1821 18310
1822 18390
1823 18480
1824 18580
1825 18690
1826 18800
1827 18920
1828 19040
1829 19180
1830 19320
1831 19470
1832 19620
1833 19780
1834 19930
1835 20080
1836 20240
1837 20400
1838 20550
1839 20710
1840 20870
1841 21040
1842 21200
1843 21360
1844 21530
1845 21700
1846 21870
1847 22040
1848 22210
1849 22380
1850 22550
1851 22700
1852 22860
1853 23020
1854 23170
1855 23330
1856 23490
1857 23650
1858 23810
1859 23970
1860 24130
1861 24300
1862 24460
1863 24660
1864 24830
1865 25000
1866 25160
1867 25340
1868 25510
1869 25680
1870 25860
1871 26030
1872 26210
1873 26380
1874 26560
1875 26740
1876 26920
1877 27100
1878 27280
1879 27460
1880 27650
1881 27830
1882 28020
1883 28210
1884 28400
1885 28590
1886 28780
1887 28970
1888 29170
1889 29370
1890 29560
1891 29760
1892 29970
1893 30170
1894 30370
1895 30570
1896 30780
1897 30980
1898 31170
1899 31370
1900 31560
1901 31740
1902 31920
1903 32100
1904 32270
1905 32440
1906 32600
1907 32760
1908 32920
1909 33070
1910 33220
1911 33360
1912 33510
1913 33650
1914 33800
1915 33940
1916 34090
1917 34230
1918 34430
1919 34610
1920 34790
1921 34980
1922 35160
1923 35350
1924 35540
1925 35700
1926 35870
1927 36040
1928 36210
1929 36380
1930 36750
1931 37110
1932 37470
1933 37830
1934 38180
1935 38530
1936 38880
1937 39220
1938 39570
1939 39910
1940 40240
1941 40580
1942 40910
1943 41240
1944 41570
1945 41890
1946 40420
1947 38980
1948 37550
1949 36270
1950 35770
1951 35070
1952 34580
1953 34140
1954 33750
1955 33410
1956 33100
1957 32840
1958 32610
1959 32410
1960 32880
1961 33400
1962 33930
1963 34530
1964 32900
1965 34230
1966 35530
1967 36660
1968 37550
1969 38230
1970 38710
1971 39170
1972 39370
1973 39520
1974 39920
1975 40760
1976 41540
1977 42340
1978 42970
1979 43340
1980 43330
1981 42990
1982 42190
1983 41250
1984 40610
1985 40460
1986 40810
1987 41760
1988 43110
1989 44520
1990 45710
1991 46870
1992 47420
1993 47420
1994 46960
1995 46220
1996 45340
1997 44320
1998 43260
1999 42450
2000 42010
2001 41280
2002 40820
2003 40550
2004 40380
2005 40160
2006 39880
2007 39540
2008 39260
2009 39070
2010 38780
2011 38670
2012 38300
2013 37830
2014 37340
2015 36970