Year	current US$
1971	1449999.9992549415
1972	3799999.920651315
1973	5209999.9953061305
1974	9640000.067651274
1975	15800000.47385695
1976	22749999.841675173
1977	19279999.876394868
1978	19530000.112950806
1979	25469999.59275124
1980	33439999.718219068
1981	35490000.34108755
1982	41710000.05677343
1983	51790000.475943156
1984	59959999.71032133
1985	68930001.79529187
1986	96860000.90278678
1987	138589999.57703054
1988	198970001.32873648
1989	200299999.43636367
1990	210830000.37260336
1991	214500000.69662932
1992	150629999.5537846
1993	73539999.6377528
1994	78640000.63762082
1995	73260000.78953806
1996	69659998.74658881
1997	56310000.428929925
1998	59739999.22908838
1999	59719999.499619015
2000	55810000.35628677
2001	60189999.964088246
2002	66169999.97384838
2003	92290000.36790965
2004	109710000.71987511
2005	121849999.06644231
2006	149239999.54387543
2007	175629999.92817646
2008	195770002.74881724
2009	228780002.34812504
2010	235419996.64716414
2011	208379999.96170396
2012	209530001.61051765
2013	232320001.31160018
2014	275079998.01822
2015	177460001.69962654
2016	128519998.99372466
2017	117010000.19907945
2018	88070000.90368088
2019	108479998.3631819