Year	constant 2015 US$
1960	6838916000
1961	7276334000
1962	7232472000
1963	5955210000
1964	5780066000
1965	5097496000
1966	4913646000
1967	5292876000
1968	5271466000
1969	5771323000
1970	4476638000
1971	4627349000
1972	4736061000
1973	4291699000
1974	4566488000
1975	4543988000
1976	4385931000
1977	4286106000
1978	4464441000
1979	5073476000
1980	5342143000
1981	6311495000
1982	7003575000
1983	7066902000
1984	7874672000
1985	7948291000
1986	7522398000
1987	8270130000
1988	8266368000
1989	9101367000
1990	9344724000
1991	9728329000
1992	10017098000
1993	10093902000
1994	10487905000
1995	9296170000
1996	8297744000
1997	7942013000
1998	7238655000
1999	7402951000
2000	6134868000
2001	6329536000
2002	7701453000
2003	8337784000
2004	8714503000
2005	10112030000
2006	10361171000
2007	8636587000
2008	8835775000
2009	10562674000
2010	11260311000
2011	10693795000
2012	10583127000
2013	9584180000
2014	8935731000
2015	9039300000
2016	9577273000