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	0
1983	10
1984	64
1985	0
1986	0
1987	0
1988	0
1989	0
1990	2
1991	0
1992	0
1993	7
1994	2
1995	0
1996	0
1997	0
1998	18
1999	26
2000	1
2001	14
2002	23
2003	0
2004	0
2005	0
2006	0
2007	0
2008	5