Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	2206
1979	215
1980	1040
1981	0
1982	118
1983	0
1984	4510
1985	1854
1986	265
1987	90
1988	3911
1989	200
1990	148
1991	185
1992	0
1993	0
1994	53
1995	0
1996	354
1997	80
1998	807
1999	281
2000	242
2001	89
2002	180
2003	0
2004	0
2005	706
2006	0
2007	0
2008	0