Year	Annual Number
1970	14
1971	0
1972	0
1973	14
1974	0
1975	0
1976	6000
1977	1
1978	0
1979	0
1980	0
1981	0
1982	0
1983	19
1984	0
1985	2
1986	0
1987	0
1988	0
1989	0
1990	2417
1991	0
1992	0
1993	0
1994	81
1995	0
1996	0
1997	0
1998	0
1999	6
2000	0
2001	0
2002	15
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0