Year Number of
1800 18620
1801 18580
1802 18550
1803 18510
1804 18470
1805 18430
1806 18400
1807 18360
1808 18320
1809 18280
1810 18250
1811 18220
1812 18200
1813 18180
1814 18180
1815 18180
1816 18190
1817 18210
1818 18240
1819 18280
1820 18320
1821 18370
1822 18430
1823 18500
1824 18580
1825 18670
1826 18760
1827 18860
1828 18980
1829 19100
1830 19220
1831 19360
1832 19500
1833 19640
1834 19780
1835 19920
1836 20060
1837 20210
1838 20350
1839 20500
1840 20640
1841 20790
1842 20940
1843 21090
1844 21240
1845 21390
1846 21540
1847 21700
1848 21850
1849 22010
1850 22160
1851 22320
1852 22480
1853 22640
1854 22800
1855 22960
1856 23120
1857 23280
1858 23450
1859 23620
1860 23780
1861 23950
1862 24120
1863 24290
1864 24460
1865 24640
1866 24810
1867 24980
1868 25160
1869 25340
1870 25520
1871 25700
1872 25880
1873 26060
1874 26240
1875 26420
1876 26610
1877 26790
1878 26980
1879 27170
1880 27370
1881 27550
1882 27750
1883 27940
1884 28140
1885 28340
1886 28540
1887 28730
1888 28940
1889 29140
1890 29340
1891 29550
1892 29760
1893 29970
1894 30180
1895 30400
1896 30510
1897 30620
1898 30720
1899 30830
1900 30940
1901 30810
1902 30680
1903 30550
1904 30420
1905 30290
1906 30160
1907 30030
1908 29900
1909 29770
1910 29650
1911 29520
1912 29390
1913 29260
1914 29130
1915 29010
1916 28880
1917 28750
1918 28630
1919 28500
1920 28380
1921 28260
1922 28130
1923 28010
1924 27880
1925 27760
1926 27530
1927 27300
1928 27040
1929 26810
1930 26630
1931 26070
1932 25530
1933 24990
1934 24460
1935 23950
1936 23450
1937 22950
1938 22470
1939 22000
1940 21530
1941 21080
1942 20630
1943 20200
1944 19770
1945 19360
1946 18950
1947 18550
1948 18160
1949 17780
1950 17410
1951 17400
1952 17370
1953 17460
1954 17570
1955 17700
1956 17840
1957 17970
1958 18050
1959 18070
1960 17990
1961 17790
1962 17310
1963 16760
1964 16070
1965 15260
1966 14380
1967 13480
1968 12650
1969 11890
1970 11300
1971 10810
1972 10460
1973 10820
1974 11250
1975 11760
1976 12340
1977 12990
1978 13720
1979 14540
1980 18760
1981 19140
1982 18210
1983 18270
1984 18370
1985 18510
1986 18750
1987 19010
1988 19250
1989 19420
1990 19510
1991 19440
1992 19180
1993 18680
1994 17920
1995 16860
1996 15530
1997 13960
1998 12340
1999 10880
2000 9630
2001 8618
2002 7883
2003 7379
2004 7006
2005 6737
2006 6519
2007 6329
2008 6211
2009 6200
2010 6327
2011 6611
2012 6982
2013 7296
2014 7403
2015 7206