Year	current US$
1990	505752862.75850284
1991	586617818.4845961
1992	718374687.7601999
1993	869472106.5778518
1994	1120779350.5412157
1995	511853827.16049385
1996	259846544.62643427
1997	273531941.2219644
1998	252887022.63786045
1999	305573011.83531487
2000	387172670.8074534
2001	394119627.7194854
2002	427737220.4586542
2003	471101306.48199564
2004	554705374.8590909
2005	669262668.6875535
2006	762525734.8551583
2007	866021146.9637305
2008	1076434232.0712605
2009	1005211128.2656668
2010	1236269981.32884
2011	1309056715.1543498
2012	1416053264.2716737
2013	1616609337.335381
2014	1729143412.9089303
2015	1697779603.144832
2016	1252713010.9660294
2017	1073689161.7833939
2018	864246426.536199