Year	2007 US$
1967	288200000
1968	160200000
1969	272200000
1970	399400000
1971	84640000
1972	123000000
1973	737900000
1974	681100000
1975	616800000
1976	110600000
1977	577500000
1978	387600000
1979	341600000
1980	364000000
1981	391500000
1982	354400000
1983	395500000
1984	710200000
1985	648000000
1986	614300000
1987	562300000
1988	693200000
1989	642400000
1990	627000000
1991	592600000
1992	771600000
1993	809700000
1994	1044000000
1995	1630000000
1996	895700000
1997	891600000
1998	995000000
1999	901000000
2000	1094000000
2001	1067000000
2002	1060000000
2003	1114000000
2004	1128000000
2005	1207000000
2006	1413000000
2007	1673000000