Year	Annual Number
1970	0
1971	50110
1972	0
1973	150100
1974	0
1975	0
1976	0
1977	1000
1978	0
1979	0
1980	15650000
1981	0
1982	1300000
1983	1183000
1984	652000
1985	451100
1986	2503000
1987	937100
1988	1320000
1989	6418000
1990	502200
1991	477900
1992	79390
1993	38960
1994	11030
1995	23070
1996	667900
1997	1085000
1998	2526000
1999	10
2000	14560
2001	200700
2002	1800
2003	5018
2004	501000
2005	367800
2006	3298000
2007	685500
2008	156900