Year	Annual Number
1970	3948000
1971	163
1972	25200
1973	51900
1974	2800
1975	0
1976	247
1977	11230
1978	1130
1979	203
1980	1061
1981	2038000
1982	0
1983	6035
1984	0
1985	1846000
1986	2723000
1987	12
1988	10580000
1989	104800
1990	59260
1991	15580000
1992	10320
1993	868500
1994	659200
1995	2374000
1996	119300
1997	3804000
1998	230600
1999	101600
2000	146700
2001	28990
2002	101500
2003	480
2004	18440
2005	35780
2006	18300
2007	8983000
2008	0