Year	constant 2015 US$
1960	2206010000
1961	3078030000
1962	3975220000
1963	3654970000
1964	4793600000
1965	5118780000
1966	5056230000
1967	4427780000
1968	4319140000
1969	4171890000
1970	4244140000
1971	4770140000
1972	4883300000
1973	7003700000
1974	10238780000
1975	11394510000
1976	10840310000
1977	11984280000
1978	12210210000
1979	15248490000
1980	15837510000
1981	16535810000
1982	15812310000
1983	14483130000
1984	15807150000
1985	16342080000
1986	16225400000
1987	16704330000
1988	15695090000
1989	16402560000
1990	18053020000
1991	16640640000
1992	16799410000
1993	15679490000
1994	17000430000
1995	14155920000
1996	12498030000
1997	13115480000
1998	13114060000
1999	12193130000
2000	12378800000
2001	15547920000
2002	19387510000
2003	23583900000
2004	21631590000
2005	21476630000
2006	23324930000
2007	26832690000
2008	28429620000
2009	32274910000
2010	35764300000
2011	34984790000
2012	34735650000
2013	36615200000
2014	36756990000
2015	40881990000
2016	45004380000
2017	50262710000