Year	Number
1970	1775300
1971	2056800
1972	2284900
1973	2409000
1974	2401900
1975	2518100
1976	2795700
1977	2946800
1978	3117200
1979	3556200
1980	3329700
1981	3065000
1982	3536900
1983	3947700
1984	3229200
1985	3494000
1986	3834000
1987	4148100
1988	4376700
1989	4720600
1990	4840300
1991	4582000
1992	4826800
1993	5077900
1994	5381000
1995	5689300
1996	5892000
1997	6236400
1998	5946600
1999	5767700
2000	5922623
2001	6382092
2002	6322432
2003	5886037
2004	6428701