Year	Total
1960	995
1961	932.3
1962	919
1963	903.8
1964	805.4
1965	784.7
1966	739.7
1967	538.4
1968	328.6
1969	186.8
1970	377.7
1971	329.2
1972	434.1
1973	426.2
1974	447.4
1975	526.4
1976	596.2
1977	912.5
1978	877
1979	972
1980	952.4
1981	1563
1982	2577
1983	3099
1984	3534
1985	4979
1986	6508
1987	8156
1988	8308
1989	9532
1990	10080
1991	11920
1992	12920
1993	13890
1994	15090
1995	15590
1996	17670
1997	20240
1998	20390
1999	23780
2000	27730
2001	27140
2002	28590
2003	28470
2004	31110
2005	31300
2006	29550
2007	27080
2008	26620
2009	23910
2010	23210