Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	1400
1980	7
1981	0
1982	0
1983	0
1984	0
1985	0
1986	12
1987	3
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	11
1996	24
1997	0
1998	347
1999	0
2000	0
2001	3
2002	0
2003	8
2004	15
2005	9
2006	0
2007	163
2008	13