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	1262
1986	1307
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	100
1995	0
1996	247
1997	500
1998	481
1999	15
2000	688
2001	33
2002	93
2003	0
2004	0
2005	13
2006	144
2007	1133
2008	13