Year	current US$
1960	207510000
1961	178510000
1962	181510000
1963	343510000
1964	430510000
1965	417510000
1966	375510000
1967	470510000
1968	518660000
1969	529920000
1970	636600000
1971	1096792031.06323
1972	1306846425.54568
1973	1940049279.54285
1974	6034180127.13426
1975	8402593618.84127
1976	8123758781.96113
1977	7735202275.37194
1978	6034584774.2041
1979	7320292580.64087
1980	6603943704.52382
1981	8164362433.46063
1982	6578536376.28378
1983	7642847512.19269
1984	8901102776.13494
1985	10250774165.2021
1986	6437446674.73976
1987	5962669565.46412
1988	3091550712.54592
1989	4106383814.75543
1990	8320517576.93019
1991	10666307242.2721
1992	9562389153.95933
1993	9215805431.11612
1994	8067295632.2819
1995	6283086770.58187
1996	11788238786.826
1997	14378090447.0338
1998	11919912974.2402
1999	12277310345.5848
2000	13088483162.5221
2001	9239490222.64225
2002	8487070810.76525
2003	16034702520.6513
2004	18375430057.2128
2005	23918830547.6946
2006	29417292120.2438
2007	24196106364.9235
2008	33098128087.2778
2009	21702956993.5458
2010	13136793906.3905
2011	9930091458.85565
2012	9900149162.68605
2013	6038026409.44575
2014	7456598782.42425
2015	6324285011.52235
2016	3264516563.51161
2017	3034370364.62108