Year	current international $
2000	14.476511477886
2001	15.1378419791239
2002	17.2437460083658
2003	17.700014240221
2004	18.0534252659039
2005	19.220047494283
2006	18.2693848064718
2007	20.1409309532434
2008	20.8520913068453
2009	19.8768760269777
2010	18.2932964761268
2011	17.7263052117009
2012	16.6132864858193
2013	17.2201781704996
2014	16.9455164932158
2015	16.314712408684
2016	15.3684317703949
2017	16.1755242917596
2018	17.471266263449
2019	16.9544123599128
2020	16.6050121393047
2021	17.955114940188