Year	Annual Number
1970	0
1971	0
1972	0
1973	517
1974	0
1975	0
1976	0
1977	0
1978	9
1979	5
1980	67
1981	3
1982	9
1983	0
1984	0
1985	9500
1986	0
1987	2
1988	0
1989	3
1990	0
1991	0
1992	0
1993	0
1994	0
1995	64
1996	0
1997	1
1998	0
1999	46
2000	0
2001	0
2002	0
2003	29
2004	0
2005	0
2006	0
2007	0
2008	0