Year	Annual Number
1970	39
1971	109
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	115
1980	165
1981	113
1982	68
1983	0
1984	0
1985	57
1986	33
1987	619
1988	0
1989	109
1990	27
1991	72
1992	0
1993	32
1994	28
1995	73
1996	0
1997	0
1998	100
1999	4
2000	33
2001	11
2002	204
2003	130
2004	14
2005	11
2006	0
2007	20
2008	0