Year	Annual Number
1970	0
1971	0
1972	0
1974	0
1975	0
1976	507
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	498
1988	0
1989	0
1990	0
1991	500
1992	0
1993	0
1994	0
1995	233
1996	2156
1997	1465
1998	14890
1999	75
2000	89
2001	11930
2002	541900
2003	21190
2004	46930
2005	4973
2006	3137
2007	591
2008	0