Year	current international $
2000	5.43586448730005
2001	4.50491133524014
2002	3.00864722571362
2003	2.01930897960901
2004	4.69070641012156
2005	2.5747083498472
2006	4.35136343579272
2007	1.5737974916907
2008	1.79617910105613
2009	1.07715377223492
2010	0.934843255871459
2011	0.89899200215382
2012	0.479002557760597
2013	0.623959412951133
2014	1.4339099499862
2015	0.871962867508389
2016	1.35910621346035
2017	1.06238879769756
2018	0.88290571706585
2019	0.49050456367082
2020	1.44711559246528
2021	4.19064980374877