Year	Number
1961	20022
1962	21408
1963	23086
1964	25435
1965	27763
1966	31026
1967	28177
1968	30141.52
1969	31363.12
1970	32071.72
1971	33390.08
1972	35311.08
1973	36903.880000000005
1974	37580.04
1975	38445.479999999996
1976	39845.32
1977	41262.32
1978	39167
1979	40568
1980	41261
1981	43583
1982	45347
1983	46855
1984	47922
1985	46947
1986	46871
1987	47624
1988	49101
1989	49782
1990	51582
1992	100998
1993	98502
1994	98396
1995	99154