Year	Annual Number
1970	0
1971	0
1972	0
1973	2516
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	30020
1981	0
1982	0
1983	0
1984	0
1985	307
1986	0
1987	0
1988	810000
1989	0
1990	0
1991	0
1992	0
1993	0
1994	4
1995	0
1996	800
1997	0
1998	0
1999	0
2000	0
2001	201
2002	1504
2003	0
2004	350100
2005	10400
2006	0
2007	33190
2008	4013