Year	Number
1961	738506
1962	795166
1963	858044
1964	916197
1965	971146
1966	1061459
1967	1158140
1968	1251144
1969	1358744
1970	1367307
1971	1486879
1972	1606013
1973	1740099
1974	1889082
1975	2138028
1976	2309639
1977	2532290
1978	2813205
1979	3107950
1980	3305919
1981	3550951
1982	3696361
1983	3853781
1984	4056902
1985	4239808.57
1986	4452061.140000001
1987	4639226.71
1988	4812184
1989	5051581
1990	5202502
1991	5326472
1992	7890433
1993	7895640
1994	7850225
1995	7905025
1996	7914966
1997	8060095
1998	8123486
1999	8333885.5
2000	8625254
2002	7925001