Year	current US$
1990	422195657.765575
1991	679253259.80918
1992	320453764.901618
1993	145276560.948312
1994	254815160.9555
1995	619036956.987074
1996	1017233660.45854
1997	1203130805.07102
1998	995528206.529008
1999	1471454124.72841
2000	2900253900.77575
2001	3658100615.7976
2002	4410535145.30584
2003	4986948667.81285
2004	5664785058.21904
2005	6115398031.6436
2006	7511512619.00255
2007	7715432356.4048
2008	8111374049.00909
2009	6935554590.72352
2010	5868353775.49031
2011	4448938820.12166
2012	6067581007.79467
2013	5284071754.57831
2014	4357504076.77657
2015	1442757093.53636
2016	877442199.453388
2017	920558927.722887
2018	2983208349.3994
2019	1653643445.98599
2020	969612981.567713
2021	1687999721.249
2022	1250826378.53556