Year	Annual Number
1970	66820
1971	0
1972	12
1973	0
1974	78
1975	0
1976	0
1977	0
1978	0
1979	13
1980	7
1981	18
1982	3
1983	10
1984	0
1985	0
1986	16
1987	0
1988	0
1989	0
1990	200
1991	64
1992	0
1993	6
1994	0
1995	0
1996	14
1997	0
1998	0
1999	1
2000	0
2001	151
2002	0
2003	0
2004	0
2005	5
2006	0
2007	519
2008	0