Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	33
1975	0
1976	0
1977	0
1978	0
1979	0
1980	75
1981	10
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	13
1989	0
1990	69
1991	42
1992	0
1993	0
1994	0
1995	63
1996	0
1997	0
1998	92
1999	0
2000	2
2001	12
2002	34
2003	8
2004	23
2005	7
2006	59
2007	16
2008	0