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	0
1991	0
1992	0
1993	100000
1994	2
1995	0
1996	0
1997	5200
1998	0
1999	100000
2000	0
2001	0
2002	330100
2003	0
2004	0
2005	451
2006	1000
2007	1
2008	0