Year	Total
1971	2322
1972	6793
1973	7223
1974	10830
1975	14790
1976	14620
1977	13240
1978	16340
1979	16680
1980	18920
1981	21410
1982	20810
1983	16940
1984	17200
1985	18570
1986	27340
1987	27520
1988	33710
1989	34910
1990	39290
1991	28550
1992	27600
1993	23560
1994	20030
1995	21750
1996	23390
1997	17200
1998	26310
1999	34820
2000	24330
2001	24330
2002	22360
2003	21930
2004	22360
2005	22790
2006	23300
2007	13240
2008	15560
2009	17800
2010	15220