Year	Annual Number
1970	266500
1971	0
1972	0
1973	0
1974	0
1975	12010
1976	0
1977	38000
1978	0
1979	6308
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	38790
1996	60020
1997	60
1998	0
1999	0
2000	956
2001	315
2002	15100
2003	10040
2004	0
2005	0
2006	2117
2007	0
2008	20040