Year	Total
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	6105
1978	199800
1979	271000
1980	299000
1981	249100
1982	324800
1983	770900
1984	1014000
1985	1440000
1986	2434000
1987	3380000
1988	3448000
1989	4073000
1990	4547000
1991	4842000
1992	4861000
1993	4999000
1994	5043000
1995	5763000
1996	6356000
1997	6628000
1998	7712000
1999	8862000
2000	9369000
2001	9642000
2002	10240000
2003	11150000
2004	11240000
2005	12620000
2006	12790000
2007	12290000
2008	12980000
2009	12710000
2010	12780000
2011	12910000