Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	129
1977	120
1978	2726
1979	0
1980	2900
1981	2250
1982	0
1983	140
1984	6805
1985	274
1986	1831
1987	700
1988	1959
1989	154
1990	0
1991	248
1992	0
1993	0
1994	157
1995	0
1996	0
1997	200
1998	200
1999	350
2000	0
2001	0
2002	300
2003	0
2004	5354
2005	400
2006	1200
2007	0
2008	0