Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	2635
1981	0
1982	0
1983	0
1984	0
1985	30
1986	0
1987	1
1988	0
1989	22
1990	0
1991	0
1992	0
1993	0
1994	171
1995	0
1996	0
1997	0
1998	0
1999	22
2000	0
2001	0
2002	0
2003	2275
2004	0
2005	0
2006	4
2007	0
2008	0