Year	Annual Number
1970	350
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	130
1979	0
1980	0
1981	750
1982	92
1983	186
1984	200
1985	46
1986	22
1987	188
1988	27
1989	0
1990	30
1991	51
1992	0
1993	1048
1994	0
1995	140
1996	788
1997	0
1998	310
1999	170
2000	144
2001	0
2002	0
2003	239
2004	185
2005	51
2006	0
2007	214
2008	115