Year	current international $
2000	6.28737715395512
2001	6.31671648565616
2002	6.08990788068462
2003	6.05781387259409
2004	6.06459802520685
2005	5.87300104490591
2006	8.88262249629403
2007	8.9597136015185
2008	8.9154536127502
2009	8.38315844614207
2010	8.64711049266053
2011	8.95385947220398
2012	9.34532279001534
2013	9.25411601526015
2014	9.81117483642153
2015	9.784503630134
2016	10.0675121035528
2017	11.0124561534587
2018	11.2594911080453
2019	10.7065130986052
2020	8.80749399283544
2021	10.9052951317142