Year	current international $
2000	5.89654642107016
2001	5.40532548746289
2002	4.37293009501896
2003	5.93912807755553
2004	5.27537207132422
2005	5.86237944431344
2006	9.78079163387348
2007	13.8493400800439
2008	15.9430262448047
2009	15.8118003157132
2010	11.1305305474308
2011	10.9605815723757
2012	11.5476493169304
2013	17.4151225947233
2014	14.7417603865134
2015	16.8568937695481
2016	24.0184035472906
2017	19.2836727371283
2018	18.8563511231517
2019	19.5086335194557
2020	23.6388878787293
2021	23.6369992504462