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	0
1987	0
1988	0
1989	0
1990	27520
1991	0
1992	0
1993	0
1994	89
1995	0
1996	0
1997	35510
1998	0
1999	78000
2000	0
2001	13080
2002	2580
2003	1482
2004	0
2005	0
2006	12970
2007	1632
2008	517