Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	5
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	34
1990	0
1991	0
1992	0
1993	0
1994	100
1995	20
1996	3
1997	2311
1998	0
1999	0
2000	0
2001	0
2002	0
2003	1
2004	0
2005	12
2006	102
2007	25
2008	0