Year	current US$
1988	1.7693842869698022
1989	3.2032784199063924
1990	3.3621965551436435
1991	101.61351424702262
1992	126.15802109196657
1993	83.87230285864908
1994	50.84900250644606
1995	56.65377770373274
1996	71.5396586429649
1997	53.43550837029446
1998	85.89976450101965
1999	157.0327609999109
2000	102.89648038152986
2001	87.74994053581186
2002	100.74040575139479
2003	114.9191205595029
2004	99.42057056366383
2005	104.62604904894692
2006	108.28234562228162
2007	89.46750177547906
2008	117.02519774347387
2009	112.97279743917221
2010	125.32350687627003
2011	130.62118411546487
2012	120.383355150584
2013	93.25438051237336
2014	97.32083491204676
2015	116.34660138935148
2016	59.46939738421322
2017	58.587967769664196
2018	120.19357858622595
2019	9.484298596283221
2020	109.08966142041596
2021	225.28279778258016
2022	113.58723376361608