Year	current US$
1970	7290000.008419162
1971	6810000.175610191
1972	8650000.080466263
1973	17809999.816119667
1974	21579999.554902323
1975	32529999.95648859
1976	30729999.272152785
1977	30990000.0225752
1978	34340000.385418534
1979	54959999.85188244
1980	53750000.07264317
1981	43220000.220462635
1982	31950000.062584873
1983	29930000.4094839
1984	22739999.93875624
1985	27020000.003278248
1986	24919999.726116657
1987	45089999.46340916
1988	35820000.099018194
1989	15389999.808743598
1990	38290000.325068824
1991	198639994.48716605
1992	116500000.33527617
1993	61190000.3477931
1994	77540001.66431071
1995	65580000.877380356
1996	62880000.747740254
1997	59880000.07905065
1998	49819999.97422098
1999	47450000.11473893
2000	79170000.92566009
2001	32379999.890923504
2002	80540000.39026141
2003	51940000.33847979
2004	43150000.531226456
2005	61419999.1114437
2006	81710001.33454798
2007	65529999.719932675
2008	85550001.49831177
2009	80959999.19995663
2010	60779998.85939069
2011	73500000.48801294
2012	50490000.890567966
2013	53749999.91431827
2014	50559999.54044816
2015	44190000.57503582
2016	51999999.02769931
2017	36400000.097230084
2018	57929999.11680822
2019	43890000.29861931
2020	37459999.96736651
2021	40670000.35569076
2022	23749999.729916453