Year	Total
1971	15200
1972	14640
1973	15200
1974	15060
1975	17760
1976	19040
1977	17620
1978	16470
1979	15600
1980	15090
1981	17440
1982	17930
1983	20740
1984	22400
1985	26750
1986	30270
1987	31560
1988	33620
1989	34680
1990	38310
1991	39510
1992	41740
1993	44330
1994	46250
1995	48660
1996	50160
1997	51530
1998	51770
1999	54010
2000	61010
2001	65340
2002	63340
2003	60530
2004	58870
2005	60260
2006	61670
2007	60500
2008	63440
2009	67200