Year	current US$
1990	6785855.43474758
1991	7173181.96510573
1992	7769645.84958432
1993	8272993.86527224
1994	8932648.34412619
1995	9630898.97186233
1996	7321959.08383801
1997	9768099.27826618
1998	10613872.9210296
1999	12070685.1050462
2000	12807511.7680152
2001	11838172.9586273
2002	12494712.4939997
2003	13238116.1140547
2004	13899334.4938361
2005	15355723.1244697
2006	15940462.1557238
2007	16997144.4424773
2008	16907775.8701472
2009	19332233.5600096
2010	18575857.0048364
2011	19686736.2456234
2012	21127633.2296127
2013	24244039.5374311
2014	25253067.7176896
2015	26775069.9310359
2016	30165704.6563117
2017	33301212.0752574
2018	35652659.562756
2019	39147763.0700302
2020	40792187.0024933
2021	48048952.6409981