Year	Annual Number
1970	61
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	10
1984	0
1985	0
1986	11
1987	3
1988	27
1989	0
1990	0
1991	0
1992	0
1993	30
1994	0
1995	0
1996	0
1997	0
1998	0
1999	1
2000	12
2001	11
2002	0
2003	8
2004	16
2005	13
2006	6
2007	46
2008	0