Year	Annual Number
1970	0
1971	115000
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	459000
1979	0
1980	0
1981	0
1982	0
1983	0
1984	2014
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	332000
1992	160
1993	0
1994	190000
1995	591400
1996	420000
1997	0
1998	0
1999	0
2000	450000
2001	453000
2002	150000
2003	0
2004	0
2005	0
2006	0
2007	0
2008	204200