Year	current US$
2000	157.34842718720697
2001	158.9470858494401
2002	169.16138430203705
2003	177.85880359862426
2004	186.64176010047404
2005	203.72772299063155
2006	227.31934629967003
2007	244.8195043261944
2008	257.67597442057934
2009	253.28816003179446
2010	262.2708083602385
2011	275.2713715842698
2012	292.2440322186533
2013	297.34971151494375
2014	303.2370509044252
2015	297.43396859747014
2016	279.3412288644248
2017	291.1654857887975
2018	299.06619827791167
2019	304.7484391563058
2020	264.12231828536005
2021	289.95192024284387