Year	Annual Number
1970	319
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	0
1988	0
1989	186
1990	0
1991	2842
1992	0
1993	0
1994	0
1995	3022
1996	882
1997	262
1998	0
1999	49
2000	190
2001	573
2002	316
2003	195
2004	154
2005	44
2006	62
2007	0
2008	173