Year	Annual Number
1970	2000
1971	6910000
1972	4530000
1973	0
1974	25120
1975	2501
1976	600300
1977	14490000
1978	4011
1979	1606000
1980	153
1981	132500
1982	5301000
1983	1558000
1984	1336000
1985	105200
1986	3300000
1987	80170
1988	1900000
1989	3700000
1990	4102000
1991	25120
1992	185
1993	72690
1994	428800
1995	12220
1996	9179000
1997	25
1998	4665000
1999	13880000
2000	30000
2001	27100
2002	15390
2003	531500
2004	0
2005	68670
2006	150500
2007	0
2008	0