Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	7
1978	9
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	9
1986	0
1987	0
1988	45
1989	0
1990	0
1991	0
1992	0
1993	2
1994	4
1995	27
1996	40
1997	326
1998	0
1999	48
2000	69
2001	5
2002	22
2003	119
2004	0
2005	211
2006	951
2007	17
2008	45