Year	current international $
2000	12.6973979943809
2001	14.2310493206528
2002	14.8807498965361
2003	15.9244124413868
2004	17.493431177556
2005	17.9561494723735
2006	19.1545906175933
2007	20.138227502976
2008	20.3829549783209
2009	21.1653393472959
2010	19.6181635933395
2011	20.7924721451453
2012	23.7296200312309
2013	15.0774540750739
2014	14.4998815308624
2015	18.3005607846843
2016	24.0776423162862
2017	32.2397920446778
2018	41.8156010117145
2019	44.0064092762229
2020	41.5955131191593
2021	42.6413259625018