Year	current US$
1997	4676802518729.74
1998	4601019690618.738
1999	4766731890520.639
2000	4843922756552.287
2001	4515708043800.227
2002	4586307350863.99
2003	5086633009120.047
2004	5647819009398.118
2005	5892772241654.848
2006	6171963466839.539
2007	6727701770595.371
2008	6967560993334.67
2009	6078589362923.441
2010	6672211902083.826
2011	7176721077493.155
2012	7105460641161.607
2013	7065873728392.659
2014	7203100492502.564
2015	6864229528032.177
2016	6953995073321.441
2017	7304605378566.949
2018	7759010741629.1455
2019	7640520881759.699
2020	7349685622141.378
2021	8266571480691.447