Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	213
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	164
1989	11
1990	147
1991	97
1992	0
1993	56
1994	13
1995	0
1996	373
1997	0
1998	0
1999	23
2000	56
2001	0
2002	15
2003	27
2004	0
2005	0
2006	0
2007	0
2008	0