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	10020
1989	14640
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	6437
1999	2202
2000	15
2001	3502
2002	22520
2003	10000
2004	0
2005	1860
2006	1001
2007	88880
2008	2500