Year	constant 2015 US$
1960	5182680000
1961	6818690000
1962	7214280000
1963	7007210000
1964	7560850000
1965	7850380000
1966	8134860000
1967	8800560000
1968	7826740000
1969	7273900000
1970	7195780000
1971	7651170000
1972	7319920000
1973	7922160000
1974	10263680000
1975	11887670000
1976	10778130000
1977	11769340000
1978	13820620000
1979	15541300000
1980	16420300000
1981	17075350000
1982	18474720000
1983	18150430000
1984	20872710000
1985	22586270000
1986	21730020000
1987	21514880000
1988	22721350000
1989	24519030000
1990	24731490000
1991	24104390000
1992	24670500000
1993	23222780000
1994	24827490000
1995	21537740000
1996	19384980000
1997	19328200000
1998	18968970000
1999	17350760000
2000	18149660000
2001	20475510000
2002	26136580000
2003	29766210000
2004	28706720000
2005	34448370000
2006	41996740000
2007	34233520000
2008	36614050000
2009	41744330000
2010	41562390000
2011	42215930000
2012	42735190000
2013	43250090000
2014	41890580000
2015	45592230000
2016	44233030000
2017	48426980000