Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	6068
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	8826
1995	0
1996	27930
1997	23080
1998	0
1999	2573
2000	0
2001	0
2002	0
2003	0
2004	202
2005	25510
2006	0
2007	0
2008	14220