Year	current US$
1990	327238376.386764
1991	342817480.597852
1992	227214019.7244
1993	255508840.422633
1994	243896566.826708
1995	260105315.716135
1996	253427540.205505
1997	202012259.676108
1998	200675492.422786
1999	206804229.638517
2000	187903236.866274
2001	111741645.979067
2002	98555340.6548498
2003	78676410.7325722
2004	105206704.183659
2005	154707503.590074
2006	231838210.069131
2007	219980932.865681
2008	162585946.183859
2009	185148751.857461
2010	154068812.640834
2011	170790564.672062
2012	180705253.685205
2013	180477011.553456
2014	215428890.329084
2015	302121594.226292
2016	317307640.477813
2017	253412755.386133
2018	193558095.910616
2019	219698675.235723
2020	310927717.927353
2021	296529429.742422