Year	Total
1971	4848
1972	5035
1973	5343
1974	5475
1975	5455
1976	5783
1977	6023
1978	6175
1979	6403
1980	6745
1981	6878
1982	7330
1983	7780
1984	7973
1985	8417
1986	8950
1987	8780
1988	9824
1989	10230
1990	10760
1991	10850
1992	11370
1993	11960
1994	12450
1995	12780
1996	12960
1997	13100
1998	13700
1999	14440
2000	15160
2001	16180
2002	16740
2003	17550
2004	18430
2005	19340
2006	21230
2007	22130
2008	23390
2009	24840