Year	current international $
2000	3.25648926193668
2001	3.53057111043587
2002	3.75250696072571
2003	3.98132733368205
2004	4.21729260363697
2005	5.49023311055814
2006	5.84065086375426
2007	6.73393329152594
2008	6.49076041570637
2009	6.32203853923774
2010	6.40311571896602
2011	5.52255698843274
2012	6.50222343596386
2013	5.90795651176198
2014	6.67775319093857
2015	14.943615847113
2016	7.63360392944466
2017	9.33153210306911
2018	7.65166383354389
2019	10.9634394601767
2020	12.4413863120721
2021	10.8336371000803