Year	Annual Number
1970	0
1971	0
1972	0
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	187
1987	40
1988	20
1989	0
1990	20
1991	0
1992	0
1993	0
1994	14
1995	0
1996	16
1997	0
1998	16
1999	18
2000	19
2001	19
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	33