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	16
1984	0
1985	39
1986	0
1987	0
1988	137
1989	110
1990	72
1991	10
1992	0
1993	132
1994	0
1995	232
1996	14
1997	0
1998	53
1999	0
2000	13
2001	16
2002	92
2003	0
2004	0
2005	20
2006	0
2007	0
2008	0