Year	current US$
1990	1817639.8485931
1991	2049480.56145878
1992	2277309.9903954
1993	2523964.23008305
1994	2782300.30390816
1995	3057428.24503566
1996	3342633.49479562
1997	3476781.0990439
1998	3766212.97197824
1999	4082731.72670679
2000	4454786.70191833
2001	4851710.22894562
2002	5239717.91015505
2003	5673478.60298031
2004	6839355.17276252
2005	7910523.80268836
2006	8338088.29038331
2007	8756104.45695578
2008	8588076.50549908
2009	9113767.76707392
2010	9716602.58421335
2011	10439935.2951938
2012	10874516.803902
2013	12606900.0970458
2014	11448057.4857686
2015	10779573.958522
2016	12928160.0557745
2017	13095982.2642573
2018	14104348.9919849
2019	14680412.0627413
2020	14258071.9496507
2021	14753710.0463615