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	12
1983	11
1984	4
1985	0
1986	0
1987	4
1988	0
1989	9
1990	43
1991	0
1992	2048
1993	1732
1994	0
1995	5016
1996	1
1997	0
1998	696
1999	3500000
2000	213
2001	434
2002	258
2003	76
2004	11
2005	0
2006	607
2007	905
2008	2709