Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	1475
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	3950
1991	46680
1992	50640
1993	0
1994	0
1995	898
1996	815
1997	1448
1998	485
1999	1094
2000	911
2001	268
2002	32
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0