Year	current US$
2000	36.4628475
2001	39.27511311
2002	36.68064094
2003	46.18004562
2004	50.07811554
2005	59.93329728
2006	59.95412553
2007	57.67958222
2008	71.2849974
2009	56.72700304
2010	63.20158011
2011	87.4904298
2012	77.76193732
2013	80.76291669
2014	97.72372294
2015	92.80496522
2016	105.12086377
2017	104.80573238
2018	111.14366847
2019	119.33758311
2020	98.3255565
2021	67.97429529