Year	Total
1971	387100000
1972	436100000
1973	511100000
1974	575100000
1975	635100000
1976	755100000
1977	835200000
1978	974200000
1979	1089000000
1980	1061000000
1981	1161000000
1982	1486000000
1983	1643000000
1984	2040000000
1985	2297000000
1986	3819000000
1987	4195000000
1988	4602000000
1989	5232000000
1990	6057000000
1991	6423000000
1992	7120000000
1993	7126000000
1994	7609000000
1995	7967000000
1996	8440000000
1997	8543000000
1998	9588000000
1999	10570000000
2000	11330000000
2001	12040000000
2002	12820000000
2003	14320000000
2004	14950000000
2005	17330000000
2006	16600000000
2007	17720000000
2008	19920000000