Year	current US$
1990	2423519.79812414
1991	2689943.23691465
1992	2813147.63519432
1993	3084845.17010151
1994	2928737.16200859
1995	3057428.24503566
1996	3342633.49479562
1997	3642342.10376027
1998	3937404.47070452
1999	4082731.72670679
2000	4083554.47675847
2001	4075436.59231432
2002	4433607.60103868
2003	4832963.15001852
2004	5074360.3424941
2005	5351236.73084142
2006	5640471.53354551
2007	5150649.70313594
2008	5904302.69750898
2009	5799669.98569638
2010	5429866.02475186
2011	5369109.88517001
2012	5903309.1485742
2013	6141823.27241281
2014	5387320.99269108
2015	5563650.90821927
2016	5386733.35657269
2017	5986734.71751426
2018	5485024.41339119
2019	6116838.3594755
2020	5714555.433249
2021	5847876.77252899