Year	current US$
1960	900000000
1961	1063636363.6363636
1962	1236363636.3636365
1963	1080000000
1964	1405882352.9411764
1965	1237931034.4827585
1966	1166666666.6666667
1967	1049523809.5238094
1968	1114224137.9310346
1969	1377419354.8387096
1970	1736290322.580645
1971	1868951612.9032257
1972	1514877589.4538605
1973	2151691948.6581097
1974	2930236794.1712203
1975	2497271914.132379
1976	2390006056.935191
1977	2820012911.5558424
1978	3278382865.6815543
1979	4905664710.385303
1980	7703075057.863993
1981	7512378393.4031315
1982	6192528694.145672
1983	3527228298.8131256
1984	3350312203.674879
1985	3242269366.1275654
1986	4030442304.8985033
1987	5160028733.3386545
1988	5653465622.707506
1989	5890131331.116041
1990	6533905551.508186
1991	7853331304.58357
1992	9299172642.795652
1993	10893980399.341097
1994	12734104070.308847
1995	14059724838.557253
1996	14799293336.927654
1997	17954241205.07109
1998	18928878781.220287
1999	18209681946.85739
2000	17460822579.802692
2001	15858024762.452345
2002	9982423259.160162
2003	8395684885.39504
2004	9413268215.358244
2005	12055959364.50614
2006	13943509272.78197
2007	16663970495.536518
2008	21591049732.0748
2009	21792708852.182312
2010	28089771699.126713
2011	33608572927.246098
2012	36353342153.04096
2013	41099109093.38759
2014	41265845093.94617
2015	38548534913.73685