Year	Annual Number
1970	0
1971	0
1972	0
1973	0
1974	0
1975	145000
1976	0
1977	0
1978	100000
1979	0
1980	0
1981	0
1982	0
1983	132000
1984	0
1985	0
1986	0
1987	0
1988	2500000
1989	0
1990	0
1991	0
1992	0
1993	2021
1994	5973
1995	0
1996	120600
1997	100000
1998	1000000
1999	280900
2000	0
2001	97000
2002	100000
2003	325100
2004	0
2005	160800
2006	167000
2007	565500
2008	92810