Year	Total
1971	8149
1972	8751
1973	9975
1974	10870
1975	12190
1976	12210
1977	13290
1978	13650
1979	12960
1980	13140
1981	12220
1982	12180
1983	11430
1984	12380
1985	12820
1986	12540
1987	12010
1988	12430
1989	12340
1990	12610
1991	12230
1992	12360
1993	11570
1994	12270
1995	12170
1996	12900
1997	12860
1998	13870
1999	16080
2000	19990
2001	20640
2002	23950
2003	30990
2004	33040
2005	36430
2006	42770
2007	43160
2008	42730
2009	44000