Year	Annual Number
1971	0
1972	0
1973	0
1975	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	23
1989	0
1990	380
1991	0
1992	16080
1993	0
1994	0
1995	49
1996	0
1997	292
1998	100
1999	15
2000	66
2001	0
2002	50
2003	21
2004	14
2005	0
2006	5
2007	0
2008	0