Year	Annual Number
1970	0
1971	65
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	2
1984	0
1985	0
1986	0
1987	8
1988	0
1989	67
1990	0
1991	2
1992	1
1993	2
1994	60
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	1
2002	0
2003	2
2004	0
2005	0
2006	0
2007	0
2008	0