Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	61
1978	0
1979	0
1980	0
1981	26
1982	0
1983	82
1984	0
1985	0
1986	65
1987	61
1988	0
1989	13
1990	5
1991	33
1992	8
1993	0
1994	45
1995	0
1996	65
1997	44
1998	13
1999	0
2000	103
2001	195
2002	8
2003	3
2004	79
2005	17
2006	3
2007	18
2008	47