Year	current US$
1992	1071675.28959784
1993	1261982.11504153
1994	1317931.72290386
1995	1375842.71026605
1996	1432557.21205526
1997	1490049.04244738
1998	1711914.98726284
1999	1775100.75074208
2000	1856161.1257993
2001	2134752.50073607
2002	2418331.37779843
2003	2311417.1042495
2004	2868116.55809166
2005	3257274.48659554
2006	3433330.45101471
2007	3605454.75381982
2008	3488906.0303698
2009	3866446.7943084
2010	4000953.98021436
2011	4175974.20697302
2012	4349806.81415674
2013	4525554.06625455
2014	5050613.74423125
2015	5215923.05030267
2016	6464080.02788724
2017	6735076.97537214
2018	7052174.49599245
2019	7340206.03137061
2020	7576746.7853327
2021	8309987.04023589