Year	current US$
2000	138.8532460155783
2001	139.01776030700537
2002	150.61920067686845
2003	163.29045939866734
2004	179.30580396190652
2005	187.66519920310427
2006	203.49736371796166
2007	218.21572283543628
2008	239.14738567037352
2009	252.61978316830366
2010	254.4625220796537
2011	254.74695956970024
2012	279.36188067765636
2013	285.28116354287033
2014	286.23816096881774
2015	305.82508885517285
2016	316.89773321826027
2017	361.53146400740303
2018	362.2521138991453
2019	394.93562484441935
2020	415.7464969776076
2021	421.75694987787705