Year	Total
1971	485100000
1972	567100000
1973	579100000
1974	609100000
1975	630100000
1976	677100000
1977	751100000
1978	836200000
1979	902200000
1980	998200000
1981	1046000000
1982	1223000000
1983	1332000000
1984	1349000000
1985	1485000000
1986	1555000000
1987	1745000000
1988	1893000000
1989	1987000000
1990	2146000000
1991	2426000000
1992	2693000000
1993	2815000000
1994	3128000000
1995	3312000000
1996	3429000000
1997	3608000000
1998	3848000000
1999	3954000000
2000	4145000000
2001	3935000000
2002	4210000000
2003	4653000000
2004	5013000000
2005	5563000000
2006	6131000000
2007	6550000000
2008	7166000000