Year	Total
1971	304100000
1972	341100000
1973	356100000
1974	400100000
1975	550100000
1976	600100000
1977	700100000
1978	800100000
1979	884200000
1980	1035000000
1981	1116000000
1982	1209000000
1983	1337000000
1984	1337000000
1985	1395000000
1986	1419000000
1987	1663000000
1988	1686000000
1989	1721000000
1990	1870000000
1991	2016000000
1992	2136000000
1993	2200000000
1994	2427000000
1995	2573000000
1996	2895000000
1997	3250000000
1998	3403000000
1999	2945000000
2000	2795000000
2001	2898000000
2002	3096000000
2003	3331000000
2004	3534000000
2005	3702000000
2006	3896000000
2007	4104000000
2008	4385000000