Year	Annual Number
1970	10000
1971	0
1972	0
1973	0
1974	20000
1975	10000
1976	406000
1977	0
1978	0
1979	4186
1980	0
1981	26000
1982	15
1983	18730
1984	0
1985	16610
1986	290
1987	194200
1988	1321000
1989	246100
1990	64460
1991	283400
1992	16000
1993	142600
1994	6646
1995	1026000
1996	5312000
1997	775300
1998	1185000
1999	3037000
2000	2105000
2001	503100
2002	65880
2003	3147000
2004	436900
2005	634000
2006	411600
2007	332
2008	47170000