Year	Number
1961	24130
1962	27614
1963	31055
1964	32928
1965	35383
1966	38294
1967	42862
1968	47102
1969	50867
1970	55288
1971	54602
1972	58543
1973	58016
1974	61085
1975	65895
1976	71732
1977	75831
1978	83205
1979	91528
1980	100447
1981	110687
1982	121303
1983	129184
1984	136175
1985	75009
1986	79030
1987	83845
1988	80802
1989	84813
1990	88079
1991	92480
1992	96377
1993	100029
1994	105527
1995	113963
1996	112793