Year	Annual Number
1970	0
1971	0
1972	0
1973	517
1974	0
1975	0
1976	0
1977	0
1978	3859
1979	7540
1980	6427
1981	31
1982	26
1983	0
1984	0
1985	2140000
1986	0
1987	3052
1988	0
1989	353
1990	0
1991	0
1992	0
1993	0
1994	0
1995	67200
1996	0
1997	17000
1998	0
1999	138000
2000	1
2001	0
2002	0
2003	178600
2004	0
2005	0
2006	0
2007	0
2008	0