Year	current international $
2000	8.00420983395161
2001	6.37271315990143
2002	8.07689005591614
2003	8.70502873069771
2004	9.21650233396172
2005	9.34148801220689
2006	10.7888248155853
2007	11.97764202392
2008	11.636550903731
2009	11.9738840814055
2010	13.6766580127206
2011	15.0478497433087
2012	16.4103557639621
2013	16.3305113279694
2014	16.8702510851157
2015	16.3797714611223
2016	21.6789144346381
2017	24.2748877040658
2018	25.4834797110273
2019	25.458310167484
2020	24.1668673132098
2021	25.9282674411757