Year	Annual Number
1970	0
1971	0
1972	0
1973	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	4500
1987	1
1988	2
1989	0
1990	8
1991	0
1992	0
1993	200
1994	0
1995	5600
1996	12010
1997	29000
1998	3103
1999	0
2000	0
2001	0
2002	0
2003	2474
2004	1000
2005	5604
2006	3901
2007	500
2008	2400