Year	current US$
1990	232717456.556421
1991	220407071.865252
1992	178410004.935478
1993	150370461.620504
1994	112442611.552678
1995	115454184.168988
1996	130706461.514604
1997	120949658.654739
1998	101426945.819957
1999	99890376.0707969
2000	147604223.743344
2001	138160619.273602
2002	209966211.444159
2003	240431194.334438
2004	296362872.254531
2005	400823081.842641
2006	515795506.432725
2007	574346588.429313
2008	721435964.278254
2009	624714140.707536
2010	745655765.478685
2011	990320494.62444
2012	1055335413.26996
2013	1062185943.99879
2014	972563586.277813
2015	609590361.450956
2016	349750523.43539
2017	470525237.077658
2018	521078684.261564
2019	454503055.602906
2020	343176920.328905
2021	396085580.594131