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	83041940000
1991	85145300000
1992	79211310000
1993	74788660000
1994	76820640000
1995	67893110000
1996	67570180000
1997	64993720000
1998	69794570000
1999	70001400000
2000	70174020000
2001	75405090000
2002	86571200000
2003	87321890000
2004	90125260000
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