Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	34
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	96
1989	0
1990	0
1991	0
1992	0
1993	21
1994	8
1995	0
1996	152
1997	8
1998	103
1999	38
2000	0
2001	3
2002	0
2003	20
2004	0
2005	5
2006	27
2007	150
2008	17