Year	current international $
2000	12.4117477598981
2001	13.9183697859633
2002	14.5521328961533
2003	15.5848557326271
2004	17.1271975485353
2005	17.5777114183719
2006	18.752869265205
2007	19.718640907302
2008	19.9588054749491
2009	20.6848148279125
2010	19.1668408597981
2011	20.3616723351221
2012	23.3087765136071
2013	14.748583999269
2014	14.2150599653266
2015	18.0178568789816
2016	23.668397429293
2017	31.5719298063193
2018	41.1361181536809
2019	43.2970486911623
2020	40.9138411112507
2021	41.9413431023271