Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	2017
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	246
1992	0
1993	0
1994	0
1995	0
1996	116
1997	0
1998	3006
1999	564
2000	174
2001	0
2002	719
2003	0
2004	544
2005	0
2006	335
2007	0
2008	0