Year	Annual Number
1970	0
1971	0
1972	0
1973	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	0
1989	0
1990	0
1991	0
1992	0
1993	14890
1994	797700
1995	0
1996	234000
1997	502
1998	190100
1999	1200
2000	76500
2001	375300
2002	384900
2003	600
2004	6538
2005	9067
2006	7720
2007	14000
2008	0