Year	current US$
1990	87513243.4328903
1991	95275362.7658667
1992	101081562.866379
1993	96396687.6802105
1994	96300285.3055884
1995	100174709.410989
1996	100832348.865064
1997	92739237.5727758
1998	84167243.9748387
1999	76431641.6779633
2000	61707713.8558339
2001	54460318.7960699
2002	53446743.2254442
2003	62671679.8746682
2004	67637536.2340184
2005	54174431.4556299
2006	81165382.947412
2007	120152165.095546
2008	132988499.671219
2009	134138667.151395
2010	141103021.144878
2011	136089942.561621
2012	147616590.290014
2013	166119951.440533
2014	173587597.066622
2015	176284123.075016
2016	158594464.959058
2017	178777378.51077
2018	205112277.804429
2019	229942747.379398
2020	239123153.948139
2021	270807420.450092