Year	Annual Number
1971	0
1972	10
1973	22
1975	0
1977	0
1978	0
1979	0
1980	1260
1981	0
1982	0
1983	188
1984	0
1985	0
1986	48
1987	80
1988	0
1989	84
1990	11
1991	0
1992	0
1993	48
1994	0
1995	710
1996	0
1997	0
1998	130
1999	257
2000	35
2001	56
2002	14
2003	0
2004	3
2005	64
2006	188
2007	0
2008	0