Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	128
1981	0
1982	0
1983	0
1984	0
1985	0
1986	103
1987	0
1988	290
1989	0
1990	0
1991	0
1992	39
1993	134
1994	198
1995	0
1996	0
1997	88
1998	0
1999	0
2000	10
2001	42
2002	162
2003	275
2004	0
2005	206
2006	121
2007	0
2008	0