Year	2007 US$
1967	135200000
1968	125200000
1969	95730000
1970	249400000
1971	344000000
1972	304600000
1973	573500000
1974	1318000000
1975	550800000
1976	546500000
1977	1243000000
1978	324800000
1979	962000000
1980	747000000
1981	783200000
1982	878300000
1983	714000000
1984	922800000
1985	889500000
1986	711700000
1987	766800000
1988	677200000
1989	1054000000
1990	1064000000
1991	1114000000
1992	1080000000
1993	1372000000
1994	1161000000
1995	947200000
1996	1066000000
1997	1080000000
1998	779200000
1999	845300000
2000	761700000
2001	1093000000
2002	1151000000
2003	1080000000
2004	1222000000
2005	1420000000
2006	1618000000
2007	1525000000