Year Number of
1800 20010
1801 20010
1802 20010
1803 20010
1804 20010
1805 20010
1806 20010
1807 20010
1808 20010
1809 20010
1810 20010
1811 20020
1812 20030
1813 20050
1814 20080
1815 20120
1816 20160
1817 20210
1818 20260
1819 20330
1820 20400
1821 20480
1822 20560
1823 20650
1824 20750
1825 20860
1826 20980
1827 21100
1828 21230
1829 21370
1830 21510
1831 21670
1832 21820
1833 21980
1834 22140
1835 22300
1836 22460
1837 22620
1838 22780
1839 22940
1840 23110
1841 23270
1842 23440
1843 23610
1844 23780
1845 23950
1846 24120
1847 24290
1848 24460
1849 24640
1850 24820
1851 24990
1852 25170
1853 25340
1854 25520
1855 25700
1856 25880
1857 26070
1858 26250
1859 26440
1860 26620
1861 26810
1862 27000
1863 27190
1864 27380
1865 27570
1866 27770
1867 27960
1868 28160
1869 28360
1870 28560
1871 28760
1872 28960
1873 29160
1874 29370
1875 29580
1876 29780
1877 29990
1878 30200
1879 30410
1880 30630
1881 30840
1882 31060
1883 31280
1884 31490
1885 31710
1886 31940
1887 32160
1888 32390
1889 32610
1890 32840
1891 33080
1892 33310
1893 33540
1894 33780
1895 34010
1896 34250
1897 34480
1898 34710
1899 34940
1900 35160
1901 35380
1902 35580
1903 35790
1904 36000
1905 36200
1906 36390
1907 36580
1908 36760
1909 36940
1910 37120
1911 37300
1912 37470
1913 37640
1914 37820
1915 37990
1916 38170
1917 38340
1918 38530
1919 38710
1920 38890
1921 39070
1922 39260
1923 39440
1924 39630
1925 39820
1926 40000
1927 40190
1928 40380
1929 40560
1930 40940
1931 41310
1932 41680
1933 42050
1934 42420
1935 42780
1936 43140
1937 43500
1938 43860
1939 44210
1940 44560
1941 42960
1942 41390
1943 39840
1944 38310
1945 36600
1946 34960
1947 33390
1948 31890
1949 30460
1950 29080
1951 27860
1952 27050
1953 25570
1954 26410
1955 26660
1956 26720
1957 26250
1958 25510
1959 24820
1960 24470
1961 24320
1962 24580
1963 25060
1964 25480
1965 25690
1966 25760
1967 25670
1968 25580
1969 25680
1970 26030
1971 26590
1972 27380
1973 28330
1974 29350
1975 30400
1976 31440
1977 32370
1978 33140
1979 33580
1980 33720
1981 33320
1982 32570
1983 31630
1984 30510
1985 29440
1986 28530
1987 27840
1988 27550
1989 27780
1990 28570
1991 29990
1992 31760
1993 33700
1994 35530
1995 37320
1996 39020
1997 40260
1998 41070
1999 41630
2000 41970
2001 42270
2002 42530
2003 42650
2004 42990
2005 43480
2006 43650
2007 43900
2008 43930
2009 44040
2010 43670
2011 42860
2012 40170
2013 39030
2014 38530
2015 38090