Year	Annual Number
1970	0
1971	0
1972	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	0
1987	18
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	311
1995	0
1996	0
1997	0
1998	0
1999	12
2000	190
2001	12
2002	23
2003	24
2004	100
2005	72
2006	129
2007	90
2008	0