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	112
1983	10
1984	0
1985	38
1986	0
1987	0
1988	150
1989	34
1990	127
1991	0
1992	274
1993	67
1994	160
1995	0
1996	0
1997	35
1998	0
1999	61
2000	44
2001	0
2002	112
2003	0
2004	55
2005	0
2006	40
2007	0
2008	0