Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	25
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	10
1990	189
1991	0
1992	0
1993	54
1994	31
1995	3
1996	0
1997	83
1998	61
1999	0
2000	36
2001	5
2002	9
2003	0
2004	0
2005	1
2006	0
2007	0
2008	73