Year	Total
1971	9118
1972	10520
1973	11680
1974	12110
1975	11400
1976	11160
1977	10710
1978	10180
1979	11000
1980	11300
1981	10300
1982	10400
1983	12910
1984	14290
1985	15740
1986	18340
1987	22320
1988	27060
1989	27190
1990	28650
1991	29960
1992	32750
1993	30540
1994	32950
1995	36410
1996	39790
1997	41560
1998	42970
1999	43550
2000	43680
2001	43460
2002	51430
2003	51350
2004	57610
2005	70910
2006	79990
2007	95050
2008	105800
2009	101000