Year	current US$
1977	252000000
1978	181700000
1979	234600000
1980	251700000
1981	348400000
1982	384100000
1983	384300000
1984	369800000
1985	464800000
1986	423100000
1987	470000000
1988	528000000
1989	756100000
1990	739600000
1991	865700000
1992	1084700000
1993	1383000000
1994	1616000000
1995	1632000000
1996	1540000000
1997	1344000000
1998	1422000000
1999	1415000000
2000	1480000000
2001	1566000000
2002	1347000000
2003	1203000000
2004	2343100000
2005	2560000000
2006	2649000000
2007	3561348442.12
2008	4145315151.3200703
2009	4583415719.05055
2010	7040371020.10109