Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	1
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	65
1988	0
1989	228
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	65
1997	47
1998	78
1999	9
2000	351
2001	378
2002	50
2003	3
2004	0
2005	4
2006	0
2007	0
2008	33