Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	32
1980	0
1981	20
1982	0
1983	0
1984	0
1985	12
1986	0
1987	0
1988	0
1989	0
1990	0
1991	10
1992	0
1993	30
1994	0
1995	0
1996	3
1997	0
1998	0
1999	0
2000	0
2001	0
2002	3
2003	10
2004	688
2005	3
2006	0
2007	12
2008	0