Year	Annual Number
1970	0
1971	0
1972	4
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	117500
1986	0
1987	48050
1988	6700
1989	0
1990	0
1991	0
1992	1162
1993	12010
1994	0
1995	0
1996	0
1997	0
1998	2400
1999	32
2000	0
2001	802
2002	0
2003	0
2004	54010
2005	0
2006	0
2007	0
2008	0