Year	Annual Number
1970	0
1971	2349000
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	1528
1984	0
1985	1482000
1986	0
1987	5117
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	1836
1996	0
1997	53110
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0
2004	0
2005	27660
2006	0
2007	25170
2008	0