Year	current US$
2000	35.26337172
2001	32.30635082
2002	35.49824607
2003	36.19486658
2004	37.90043038
2005	40.12168716
2006	41.35579407
2007	49.49298801
2008	55.97448671
2009	64.99047735
2010	70.28687894
2011	90.65618455
2012	98.14544533
2013	105.28613215
2014	119.53012366
2015	133.59229631
2016	149.51926067
2017	173.67690041
2018	179.89072611
2019	188.09056248
2020	272.76142042
2021	318.0710189