Year	current US$
1981	11169993.093032928
1982	24734666.375830747
1983	19864819.243152987
1984	15859604.11820228
1985	11771838.07782676
1986	16004481.072887281
1987	21818298.137328394
1988	12169260.7092091
1989	20846445.439297117
1990	29798044.68652887
1991	12066310.224337071
1992	28315608.8402721
1993	28798581.28249052
1994	26751858.712592356
2001	34945386.77406587
2002	35272589.205429226
2003	30841987.413277537
2004	39091790.70225322
2005	32941593.583744474
2006	44825629.44440164
2007	33120323.79515241
2008	29432534.250275966
2009	24732126.458805457
2010	41445493.07467745
2011	67868556.43501264
2012	98722426.06215021
2013	71755289.87859288
2014	68504469.89183179
2015	42399229.50824009
2016	11943435.880320612
2017	54594969.591569684
2018	49245792.56057409
2019	133565487.0157608
2020	104150681.31450473
2021	21247161.049794037