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	0
1986	0
1987	0
1988	0
1989	0
1990	150
1991	1334
1992	640
1993	0
1994	0
1995	126
1996	118
1997	84
1998	185
1999	150
2000	319
2001	26
2002	32
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0