Year	Annual Number
1970	0
1971	0
1972	0
1973	19
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	60070
1985	0
1986	0
1987	0
1988	0
1989	33
1990	9
1991	0
1992	0
1993	0
1994	12
1995	0
1996	0
1997	371
1998	0
1999	6
2000	16
2001	10
2002	0
2003	0
2004	0
2005	0
2006	0
2007	1
2008	0