Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	100
1978	0
1979	0
1980	0
1981	0
1982	75
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	44
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	86
1998	40
1999	0
2000	0
2001	4
2002	85
2003	40
2004	54
2005	26
2006	212
2007	19
2008	55