Year	Annual Number
1970	0
1971	0
1972	118
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	52
1986	45
1987	0
1988	0
1989	39
1990	0
1991	0
1992	11
1993	0
1994	29
1995	12
1996	0
1997	0
1998	0
1999	0
2000	0
2001	0
2002	11
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0