Year Number of
1800 15390
1801 15390
1802 15390
1803 15390
1804 15390
1805 15390
1806 15390
1807 15390
1808 15390
1809 15380
1810 15380
1811 15390
1812 15400
1813 15420
1814 15450
1815 15480
1816 15520
1817 15560
1818 15620
1819 15680
1820 15740
1821 15820
1822 15900
1823 15980
1824 16080
1825 16180
1826 16290
1827 16400
1828 16530
1829 16660
1830 16800
1831 16940
1832 17090
1833 17240
1834 17390
1835 17540
1836 17690
1837 17840
1838 18000
1839 18160
1840 18310
1841 18480
1842 18640
1843 18800
1844 18970
1845 19150
1846 19320
1847 19500
1848 19680
1849 19870
1850 20050
1851 20250
1852 20450
1853 20650
1854 20850
1855 21060
1856 21270
1857 21490
1858 21710
1859 21930
1860 22160
1861 22380
1862 22620
1863 22850
1864 23090
1865 23330
1866 23570
1867 23820
1868 24060
1869 24310
1870 24560
1871 24820
1872 25080
1873 25330
1874 25590
1875 25860
1876 26120
1877 26390
1878 26660
1879 26940
1880 27220
1881 27490
1882 27770
1883 28060
1884 28350
1885 28640
1886 28940
1887 29230
1888 29530
1889 29840
1890 30150
1891 30460
1892 30780
1893 31090
1894 31420
1895 31740
1896 32080
1897 32450
1898 32830
1899 33220
1900 33640
1901 34010
1902 34350
1903 34760
1904 35180
1905 35640
1906 36100
1907 36540
1908 37020
1909 37490
1910 37980
1911 38460
1912 38960
1913 39490
1914 40050
1915 40640
1916 41240
1917 41800
1918 42360
1919 42940
1920 43470
1921 43960
1922 44400
1923 44850
1924 45290
1925 45750
1926 46200
1927 46670
1928 47130
1929 47610
1930 48410
1931 48680
1932 48930
1933 49170
1934 49380
1935 49590
1936 49770
1937 49950
1938 50100
1939 50250
1940 50380
1941 50500
1942 50600
1943 50690
1944 50770
1945 50840
1946 50890
1947 50930
1948 50970
1949 50990
1950 51000
1951 50560
1952 50410
1953 50300
1954 50250
1955 50240
1956 49120
1957 48470
1958 47540
1959 46720
1960 46340
1961 46290
1962 46620
1963 47140
1964 47590
1965 47700
1966 47520
1967 46950
1968 46150
1969 45240
1970 44370
1971 43510
1972 42570
1973 41730
1974 41140
1975 40840
1976 40840
1977 41070
1978 41530
1979 42060
1980 42680
1981 43370
1982 43940
1983 44300
1984 44280
1985 43810
1986 42910
1987 41470
1988 39780
1989 38160
1990 36830
1991 35740
1992 34950
1993 34290
1994 33660
1995 32890
1996 32010
1997 31030
1998 29980
1999 28930
2000 27900
2001 26910
2002 25940
2003 25000
2004 24200
2005 23550
2006 23010
2007 22560
2008 22150
2009 21710
2010 59720
2011 20630
2012 19950
2013 19190
2014 18460
2015 17840