Year	constant 2015 US$
1960	32306670000
1961	38739330000
1962	38419810000
1963	41554010000
1964	40623180000
1965	42697880000
1966	42090860000
1967	43404290000
1968	39951940000
1969	37887370000
1970	39886900000
1971	42470980000
1972	40941940000
1973	47679620000
1974	57608120000
1975	65263450000
1976	60951730000
1977	58627960000
1978	68329370000
1979	68759690000
1980	75703180000
1981	75545970000
1982	70392630000
1983	67912160000
1984	72185940000
1985	75747080000
1986	72843120000
1987	69779310000
1988	69634660000
1989	72425710000
1990	82659640000
1991	84404650000
1992	78192890000
1993	74069480000
1994	76211510000
1995	67175870000
1996	66830920000
1997	62754200000
1998	67386850000
1999	67738420000
2000	66877420000
2001	73256290000
2002	83664760000
2003	85352940000
2004	87752240000
2005	116337500000
2006	111203000000
2007	104103500000
2008	116313100000
2009	120289200000
2010	123112300000
2011	125901700000
2012	121423000000
2013	135850500000
2014	144666000000
2015	152693000000
2016	158215000000
2017	160758800000