Year	constant 2015 US$
1960	5162300000
1961	9074440000
1962	8479140000
1963	7646590000
1964	5811100000
1965	6883140000
1966	7335860000
1967	6808220000
1968	7926430000
1969	6344950000
1970	6575910000
1971	5823510000
1972	5714370000
1973	4653430000
1974	4980910000
1975	5218130000
1976	4918670000
1977	4600890000
1978	5886960000
1979	6142160000
1980	7471820000
1981	9653220000
1982	8842690000
1983	8208790000
1984	8969180000
1985	9348620000
1986	8170660000
1987	8510040000
1988	8036720000
1989	8684960000
1990	10809140000
1991	12122020000
1992	9710710000
1993	11103410000
1994	10937860000
1995	11761490000
1996	10473200000
1997	10023790000
1998	11645160000
1999	12685300000
2000	11647160000
2001	11901320000
2002	13261940000
2003	12987740000
2004	15786680000
2005	34397290000
2006	20749720000
2007	19606200000
2008	20705340000
2009	14204070000
2010	11575110000
2011	14778260000
2012	13336010000
2013	11812640000
2014	12458600000
2015	13286790000
2016	17187770000
2017	15481780000