Year	Annual Number
1970	430
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	360
1980	0
1981	10
1982	0
1983	250
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	2
1992	11
1993	2
1994	271
1995	55
1996	0
1997	0
1998	0
1999	1186
2000	2
2001	0
2002	0
2003	0
2004	1
2005	0
2006	0
2007	0
2008	0