Year	current US$
1990	228963898.916967
1991	101400000
1992	198413333.333334
1993	121707627.906976
1994	65567778.0323687
1995	23650758.377425
1996	20314504.5685279
1997	18344212.4151435
1998	25824997.2006459
1999	20296078.3325255
2000	18246551.3589881
2001	25820741.9947727
2002	33039773.0906986
2003	36234011.1582935
2004	53292198.9160073
2005	85135885.0028877
2006	113392386.86737
2007	158600593.692568
2008	228071850.724342
2009	208764986.087978
2010	249747481.864201
2011	304387343.902651
2012	355368406.302306
2013	403807755.728205
2014	408992863.10223
2015	353457619.725408
2016	291544716.794595
2017	311583022.293541
2018	324333548.008491
2019	347441493.783565
2020	343284137.235019
2021	381211211.242305