Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	6558
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	1603
1985	0
1986	0
1987	0
1988	153
1989	19
1990	0
1991	20
1992	0
1993	0
1994	0
1995	0
1996	4168
1997	185
1998	1613
1999	1220
2000	0
2001	1153
2002	0
2003	0
2004	0
2005	2288
2006	0
2007	0
2008	0