Year	Annual Number
1970	0
1971	9788
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	7227
1989	0
1990	0
1991	13470
1992	0
1993	0
1994	0
1995	0
1996	1411
1997	3074
1998	0
1999	0
2000	10880
2001	3557
2002	0
2003	142
2004	3711
2005	6115
2006	236
2007	0
2008	1777