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	732
1988	0
1989	16290
1990	0
1991	0
1992	0
1993	0
1994	0
1995	1007
1996	0
1997	0
1998	1228
1999	1061
2000	135
2001	459
2002	0
2003	0
2004	374
2005	0
2006	59990
2007	18860
2008	10170