Year	current international $
2000	33.1316448775459
2001	29.2826286296947
2002	31.6155351549777
2003	27.4012287417379
2004	15.9395830807588
2005	17.0530301868721
2006	18.7471180156939
2007	19.7389704891098
2008	21.0792725448381
2009	21.7501088284772
2010	21.9249824144077
2011	21.8158976030072
2012	21.2800206772044
2013	20.1763641659238
2014	20.7213379231306
2015	20.4301483585347
2016	20.1759191547921
2017	20.4835716767192
2018	20.352565008672
2019	21.747367419181
2020	21.9063051285498
2021	23.27464930253