Year	Number
1961	89817
1962	95842
1963	105358
1964	114032
1965	122860
1966	152468
1967	181352
1968	215263
1969	244718
1970	196932
1971	225640
1972	269661
1973	316748
1974	366321
1975	434839
1976	490539
1977	569803
1978	673562
1979	794803
1980	880929
1981	939659
1982	968032
1983	1007281
1984	1040130
1985	982832
1986	1008218
1987	1028404
1988	1032697
1989	1023898
1990	1006571
1991	999943
1992	995625
1993	990758
1994	1036121
1995	1054197
1996	1057361
1997	1118136
1998	1226561
1999	1380334.5
2000	1677611