Year	Total
1971	8942
1972	8942
1973	26140
1974	39470
1975	52020
1976	52450
1977	36200
1978	19860
1979	9114
1980	172
1981	12900
1982	15740
1983	19600
1984	27860
1985	29750
1986	36970
1987	43160
1988	21840
1989	2580
1990	25190
1991	33100
1992	50040
1993	42730
1994	43940
1995	41530
1996	29750
1997	32240
1998	24420
1999	34310
2000	171700
2001	197000
2002	149600
2003	151300
2004	240300
2005	213600
2006	196700
2007	264600
2008	139100
2009	248800
2010	294100