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	2473
1987	650
1988	0
1989	70
1990	60
1991	18890
1992	100
1993	0
1994	0
1995	0
1996	48120
1997	0
1998	250
1999	3493
2000	1354
2001	3180
2002	4158
2003	0
2004	2069
2005	24590
2006	0
2007	200
2008	244