Year	Total
1960	14000
1961	13420
1962	13230
1963	13360
1964	13290
1965	12350
1966	10930
1967	10280
1968	9266
1969	8261
1970	7121
1971	6845
1972	6568
1973	6509
1974	6158
1975	7965
1976	8680
1977	9058
1978	8275
1979	7618
1980	8093
1981	8175
1982	9067
1983	10950
1984	12110
1985	13960
1986	14690
1987	14480
1988	13440
1989	12960
1990	13100
1991	12970
1992	12730
1993	12100
1994	11620
1995	11930
1996	12360
1997	13400
1998	13110
1999	13910
2000	13730
2001	13320
2002	13500
2003	13700
2004	13750
2005	13910
2006	13770
2007	14370
2008	14540
2009	15320
2010	15350