Year	current international $
2000	14.4426757911696
2001	14.7047421334257
2002	15.657008328685
2003	15.1874769122776
2004	16.2709739493453
2005	17.6268964955945
2006	21.5317973582871
2007	24.036729005843
2008	21.6911706103577
2009	21.1273988890274
2010	20.9027315024789
2011	17.7356585616453
2012	13.9570788443795
2013	13.7178846936509
2014	17.5187237456226
2015	16.8164230370932
2016	16.473639835024
2017	16.2331470522092
2018	15.8849217469151
2019	16.1937796628195
2020	18.7131276032002
2021	20.3062135231201