Year	current US$
1990	4968215.58615448
1991	5251793.93873813
1992	5492335.85918892
1993	5749029.63518918
1994	6003911.1821176
1995	6573470.72682667
1996	7162786.06027632
1997	7781367.22166967
1998	8388383.4375879
1999	9053013.82878463
2000	9652037.85415637
2001	10091557.2762069
2002	10680963.2474394
2003	11136827.325092
2004	12354964.1406347
2005	13494422.4272892
2006	13488084.1496218
2007	13906754.543845
2008	14492380.002835
2009	14361087.505242
2010	14860685.6038691
2011	14615909.9466444
2012	15224324.0810385
2013	15516184.9571421
2014	15488548.4811536
2015	16343224.8667412
2016	16878430.4704293
2017	17586033.581172
2018	19197585.7387736
2019	20389460.3880474
2020	18604717.466461
2021	21479772.0146815