Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	8
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	468
1988	0
1989	2639
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	86
1997	273
1998	605
1999	250
2000	8113
2001	10140
2002	502
2003	268
2004	0
2005	210
2006	0
2007	0
2008	1021