Year	current international $
2000	5.95522267597884
2001	6.19330475281563
2002	6.78922769018437
2003	9.2098331696281
2004	13.2930204463256
2005	16.8527368079949
2006	10.9132111801055
2007	10.6224497837921
2008	10.6332505134419
2009	11.0309115981426
2010	11.7861326613989
2011	12.0956036444208
2012	11.9537087192023
2013	12.5378931444761
2014	14.0461225343398
2015	14.2833530093455
2016	14.5605989210634
2017	14.6129863568971
2018	16.6881481083765
2019	17.5420444561352
2020	16.7447823643038
2021	18.2521855785144