Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	600200
1979	48
1980	18
1981	80870
1982	0
1983	487
1984	0
1985	186
1986	45320
1987	0
1988	25
1989	0
1990	62
1991	0
1992	0
1993	2122
1994	0
1995	29010
1996	1500
1997	0
1998	0
1999	115300
2000	600
2001	300
2002	167
2003	50
2004	0
2005	0
2006	0
2007	0
2008	3710