Year	current international $
2000	4.59621678377516
2001	9.11504672702961
2002	8.9599219855011
2003	12.519670765458
2004	16.0997237277309
2005	16.0848759031326
2006	17.3011163460768
2007	17.0786924524374
2008	16.3958564203798
2009	13.8849458634884
2010	10.6919634386437
2011	9.35895131964767
2012	9.93306259007344
2013	11.9769567140144
2014	15.0757289202261
2015	15.3459283220314
2016	17.9715616493046
2017	20.2411162135854
2018	17.4616288910251
2019	17.2758240153169
2020	20.7251652902376
2021	20.8579862476306