Year	current international $
2003	2.54932355710502
2004	5.006209793521929
2005	4.362298475608476
2006	4.985345552272127
2007	6.1941905476478265
2008	3.6027713316529124
2009	4.743420317134407
2010	3.0774700398751285
2011	3.267303065023626
2012	3.287450565318664
2013	2.8840072436071114
2014	5.191410579179478
2015	3.352939956754306
2016	4.142172505015261
2017	3.221727378025831
2018	3.156451841530252
2019	4.48216984419556
2020	5.3695692947131715
2021	7.811131759174692