Year	2007 US$
1967	37300000
1968	67940000
1969	58120000
1970	111000000
1971	83760000
1972	85580000
1973	151400000
1974	111200000
1975	175600000
1976	136600000
1977	146300000
1978	128500000
1979	253100000
1980	158800000
1981	501600000
1982	428400000
1983	510400000
1984	385100000
1985	640200000
1986	399100000
1987	461800000
1988	497000000
1989	549200000
1990	493800000
1991	624800000
1992	514800000
1993	348100000
1994	487600000
1995	248600000
1996	470000000
1998	378900000
1999	532900000
2000	532100000
2001	565200000
2002	629900000
2003	680600000
2004	701400000
2005	717600000
2006	697000000
2007	628400000