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	0
1982	12
1983	11
1984	4
1985	0
1986	0
1987	4
1988	0
1989	9
1990	43
1991	0
1992	48
1993	12
1994	0
1995	16
1996	1
1997	0
1998	6
1999	103
2000	6
2001	14
2002	5
2003	6
2004	11
2005	0
2006	5
2007	5
2008	3