Year	current US$
1968	35860000.3160536
1969	35660000.2460182
1970	41940000.0870228
1971	48260000.0333041
1972	51439999.9380112
1973	55529999.4777888
1974	57120000.127703
1975	85600000.2771616
1976	66170000.337064296
1977	52879999.704659
1978	70390000.5109608
1979	92729999.0672618
1980	116059999.614954
1981	116970000.32663299
1982	108680000.379682
1983	101020000.532269
1984	92190000.8767843
1985	88930000.513792
1986	119540000.282228
1987	137469998.925924
1988	169929999.20249
1989	164630000.129342
1990	111470001.8242
1991	107099999.21545401
1992	102569999.739528
1993	95029999.6733665
1994	63200000.109151
1995	65190000.6048381
1996	71980000.4083663
1997	90590000.4394352
1998	89099999.40171841
1999	41000000.9778887
2000	47770000.081509404
2001	37830000.1081079
2002	39219999.9056757
2003	45980000.3711134
2004	57520000.1560152
2005	54280000.172555394
2006	62130000.0604242
2007	59659999.9070168
2008	65490000.0691414
2009	66710000.1759827
2010	56960000.3808737
2011	41800000.2168119
2012	39180022.8295888
2013	37043084.722012304
2014	34479573.0896294
2015	29093141.617602702
2016	27081022.642552897
2017	21644411.3464095
2018	13980041.3474441
2019	22190461.0581696
2020	23775086.067616902
2021	30983400.0356495
2022	38513583.74580742