Year	current international $
2003	15.5821489933731
2004	19.9685166954685
2005	24.5941607769429
2006	17.877107146214
2007	15.412758206428
2008	13.2903973323544
2009	11.6293836018913
2010	14.5799185690489
2011	14.0348590937316
2012	15.5004041713737
2013	14.663833677679
2014	16.2117178179885
2015	16.3117816102951
2016	16.9960493777413
2017	17.7010206106618
2018	20.342024858801
2019	20.4402792786433
2020	24.926602230862
2021	16.0381585179431