Year Number of
1800 13840
1801 13840
1802 13840
1803 13840
1804 13840
1805 13840
1806 13840
1807 13840
1808 13840
1809 13840
1810 13840
1811 13850
1812 13850
1813 13870
1814 13880
1815 13900
1816 13930
1817 13960
1818 13990
1819 14030
1820 14080
1821 14120
1822 14170
1823 14230
1824 14290
1825 14360
1826 14420
1827 14500
1828 14580
1829 14660
1830 14750
1831 14840
1832 14940
1833 15030
1834 15120
1835 15220
1836 15320
1837 15410
1838 15510
1839 15610
1840 15710
1841 15800
1842 15900
1843 16000
1844 16110
1845 16210
1846 16310
1847 16410
1848 16520
1849 16620
1850 16720
1851 16830
1852 16940
1853 17040
1854 17150
1855 17260
1856 17360
1857 17470
1858 17580
1859 17690
1860 17800
1861 17920
1862 18030
1863 18140
1864 18250
1865 18370
1866 18480
1867 18600
1868 18720
1869 18830
1870 18950
1871 19070
1872 19190
1873 19310
1874 19430
1875 19550
1876 19670
1877 19790
1878 19920
1879 20040
1880 20170
1881 20290
1882 20420
1883 20550
1884 20680
1885 20800
1886 20940
1887 21070
1888 21200
1889 21330
1890 21460
1891 21600
1892 21730
1893 21870
1894 22010
1895 22140
1896 22280
1897 22410
1898 22540
1899 22670
1900 22800
1901 22920
1902 23040
1903 23160
1904 23270
1905 23380
1906 23490
1907 23590
1908 23690
1909 23790
1910 23890
1911 23980
1912 24080
1913 24170
1914 24260
1915 24350
1916 24450
1917 24540
1918 24640
1919 24730
1920 24820
1921 24920
1922 25010
1923 25110
1924 25200
1925 25300
1926 25400
1927 25490
1928 25590
1929 25680
1930 25790
1931 25890
1932 26000
1933 26100
1934 26200
1935 26300
1936 26400
1937 26500
1938 26600
1939 26700
1940 26800
1941 26890
1942 26990
1943 27080
1944 27170
1945 27270
1946 26120
1947 25010
1948 23960
1949 22940
1950 21970
1951 21010
1952 20180
1953 19410
1954 18680
1955 17520
1956 17130
1957 16640
1958 16150
1959 15720
1960 15370
1961 15070
1962 14870
1963 14730
1964 14620
1965 14520
1966 14360
1967 14200
1968 14050
1969 14000
1970 14100
1971 14340
1972 14700
1973 15040
1974 15230
1975 15180
1976 14860
1977 14290
1978 13630
1979 13040
1980 12680
1981 12510
1982 12560
1983 12750
1984 12900
1985 12950
1986 12890
1987 12710
1988 12490
1989 12320
1990 12270
1991 12350
1992 12530
1993 12800
1994 13100
1995 13380
1996 13660
1997 13910
1998 14150
1999 14300
2000 14410
2001 14460
2002 14440
2003 14330
2004 14240
2005 14170
2006 14090
2007 14040
2008 13930
2009 13780
2010 13570
2011 13300
2012 12960
2013 12640
2014 12280
2015 11960