Year	constant 2015 US$
1960	724240000
1961	974620000
1962	922080000
1963	947920000
1964	940110000
1965	1089260000
1966	1166770000
1967	1089600000
1968	1390990000
1969	1321440000
1970	1311390000
1971	1400760000
1972	1439960000
1973	1538160000
1974	2018050000
1975	2105910000
1976	2846270000
1977	2449130000
1978	2983610000
1979	2808010000
1980	3192540000
1981	3519850000
1982	3276250000
1983	3376780000
1984	3337480000
1985	3000880000
1986	3092350000
1987	2982960000
1988	2711020000
1989	3098430000
1990	3612350000
1991	3133180000
1992	2913650000
1993	3107000000
1994	3421930000
1995	2936980000
1996	2967380000
1997	2928300000
1998	2799100000
1999	2590150000
2000	2667950000
2001	2716440000
2002	2716530000
2003	2439340000
2004	2516390000
2005	2350800000
2006	2503010000
2007	2881530000
2008	3508170000
2009	3520990000
2010	3769700000
2011	3420240000
2012	3319850000
2013	3370010000
2014	2864900000
2015	2815560000
2016	2666760000
2017	3124520000