Year	constant 2015 US$
1960	217360000
1961	83240000
1962	54450000
1963	106810000
1964	141540000
1965	218990000
1966	254450000
1967	103400000
1968	226600000
1969	58940000
1970	50180000
1971	53870000
1972	319120000
1973	164190000
1974	819040000
1975	1014710000
1976	890700000
1977	940790000
1978	1005110000
1979	1650520000
1980	1466400000
1981	1443920000
1982	1737960000
1983	2240440000
1984	1466060000
1985	2625380000
1986	1844480000
1987	1495510000
1988	1469120000
1989	1192400000
1990	1222090000
1991	1192850000
1992	689060000
1993	602860000
1994	528700000
1995	276860000
1996	262780000
1997	186290000
1998	287930000
1999	338330000
2000	320790000
2001	284320000
2002	417680000
2003	752160000
2004	1128380000
2005	2014250000
2006	2163540000
2007	2073540000
2008	2433160000
2009	2333400000
2010	1946590000
2011	1617470000
2012	1270820000
2013	1439640000
2014	802960000
2015	897470000
2016	810650000
2017	828260000