Year	Number
1961	1000
1962	1500
1963	1800
1964	2234
1965	2124
1966	2116
1967	2108
1968	2100
1969	2092
1970	2084
1971	2076
1972	2068
1973	2060
1974	2052
1975	2044
1976	2036
1977	2028
1978	2020
1979	2012
1980	2004
1981	1996
1982	1988
1983	1980
1984	1972
1985	1964
1986	1956
1987	1948
1988	1940
1989	1932
1990	1924
1991	1916
1992	1908
1993	1900
1994	1892
1995	1884
1996	1876
1997	1868
1998	1860
1999	1952
2000	1944
2001	1936
2002	1928
2003	1920
2004	1912
2005	1807