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	580000
1983	0
1984	0
1985	475100
1986	0
1987	0
1988	84000
1989	0
1990	0
1991	3
1992	0
1993	0
1994	34000
1995	123000
1996	148700
1997	51000
1998	420000
1999	57470
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	10890
2008	158200