Year	current US$
1973	0.15512774423285575
1974	46.71587405400355
1975	32.16990618848349
1976	48.60134232060994
1977	83.90910545472994
1978	55.96231722290989
1979	50.76692057437462
1980	84.76012883539583
1981	138.91449938307562
1982	75.88416258014043
1983	51.522747761116065
1984	36.10660468002555
1985	45.35112605589288
1986	78.03807934749133
1987	86.39845761315775
1988	132.06839125480823
1989	68.20039211433607
1990	72.79560594862303
1991	113.61850612995396
1992	72.22505878986607
1993	45.569158793328675
1994	62.02289848837235
1995	33.188104636488056
1996	55.445713137325995
1997	61.08006268966511
1998	137.51859590801314
1999	146.84168668248736
2000	131.63680120499527
2001	112.57626351382338
2002	175.01133789600104
2003	72.11015196209952
2004	24.068607899040295
2005	100.9152539735905
2006	40.54638693849768
2007	60.841784177698976
2008	72.91203915462133
2009	50.393927045707535
2010	229.41828400037457
2011	177.79520202347425
2012	23.838309124361956
2013	17.966711113129257
2014	28.575910532927068
2015	16.566415867476902
2016	1.987544798734122
2017	113.03899505849384
2018	192.0852201500633
2019	297.9906071945406
2020	279.93611903282397
2021	65.86639919421577