Year	Total
1971	7893
1972	7968
1973	8163
1974	8776
1975	10110
1976	10610
1977	11020
1978	10800
1979	11720
1980	11180
1981	12090
1982	13520
1983	11200
1984	13140
1985	16550
1986	17510
1987	19400
1988	21460
1989	24330
1990	26580
1991	29620
1992	30860
1993	30220
1994	31700
1995	33190
1996	37150
1997	40020
1998	39670
1999	41530
2000	44030
2001	43210
2002	45860
2003	49190
2004	51150
2005	54960
2006	56850
2007	59970
2008	64390
2009	61710