Year	current US$
1990	16856401.5741522
1991	16763305.2439939
1992	18194280.1193653
1993	19428067.3300436
1994	19353765.2382401
1995	20614912.0475137
1996	20190279.4579481
1997	21058788.8963026
1998	21061230.1056156
1999	20907682.145416
2000	20570134.5271111
2001	21399615.8138147
2002	21955116.0503668
2003	22492387.357583
2004	23387955.2605336
2005	23976459.0952419
2006	25361916.4493528
2007	27274026.3226991
2008	32072997.5316759
2009	34522362.4608205
2010	35591352.5784253
2011	39294288.0352565
2012	43149565.9529928
2013	46757864.819553
2014	48842994.5464217
2015	48304265.773264
2016	48945879.651107
2017	46676259.4959509
2018	48295971.7379857
2019	48775929.4736101
2020	46885281.9084759
2021	47048410.6467773