Year	current US$
1990	144018262.307215
1991	152534388.192983
1992	157897097.725327
1993	160147342.371086
1994	173072946.975757
1995	177485936.636954
1996	173295502.846993
1997	170767332.52157
1998	167082455.648453
1999	175249708.927997
2000	136325391.851722
2001	109306767.25121
2002	89193758.1755122
2003	89148456.6478186
2004	98499116.8444486
2005	114162492.873879
2006	129865098.523881
2007	157595601.250752
2008	195802970.042111
2009	211785675.315786
2010	302243676.338909
2011	361755472.701737
2012	403955809.766251
2013	433010743.06584
2014	477013213.903742
2015	505445426.808571
2016	506965670.809514
2017	357678081.52374
2018	294679136.131752
2019	327534720.19261
2020	326158073.046008
2021	352058201.961115