Year	constant 2015 US$
1960	4142440000
1961	4457740000
1962	4309030000
1963	4953580000
1964	3723550000
1965	3720450000
1966	4284630000
1967	4331420000
1968	4205950000
1969	4408930000
1970	3845550000
1971	4177920000
1972	4151310000
1973	3960890000
1974	3850080000
1975	4984000000
1976	5601520000
1977	6433510000
1978	5009240000
1979	6044140000
1980	5108650000
1981	5363060000
1982	4568540000
1983	5670820000
1984	5370490000
1985	6406190000
1986	6348530000
1987	4706560000
1988	4267810000
1989	4498660000
1990	4657100000
1991	4992190000
1992	5356530000
1993	4557010000
1994	4306450000
1995	2731640000
1996	5293040000
1997	1933790000
1998	2664500000
1999	1606280000
2000	647150000
2001	801930000
2002	674430000
2003	621770000
2004	504490000
2005	459370000
2006	456520000
2007	295460000
2008	457210000
2009	516550000
2010	617450000
2011	425210000
2012	411890000
2013	238960000
2014	205880000
2015	98840000
2016	252420000
2017	201010000