Year	Annual Number
1970	36
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	41
1981	0
1982	0
1983	0
1984	0
1985	37
1986	3
1987	0
1988	25
1989	0
1990	21
1991	0
1992	45
1993	0
1994	0
1995	0
1996	0
1997	0
1998	19
1999	0
2000	13
2001	1
2002	8
2003	27
2004	5
2005	0
2006	0
2007	10
2008	0