Year	Annual Number
1970	0
1971	0
1972	78
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	148
1987	33
1988	27
1989	0
1990	0
1991	0
1992	0
1993	13
1994	0
1995	0
1996	18
1997	0
1998	0
1999	13
2000	16
2001	26
2002	31
2003	62
2004	2665
2005	17
2006	11
2007	61
2008	0