Year	current international $
2000	3.96098449008751
2001	4.18432746191176
2002	4.84909569916289
2003	4.60298332985553
2004	4.92676926254624
2005	4.50544217828275
2006	4.52057660176495
2007	4.59991911824218
2008	4.62836926996433
2009	6.29097276100249
2010	7.27720355948744
2011	8.24999607874819
2012	7.49259651763362
2013	6.17216459010038
2014	6.87771259010395
2015	8.33495091437013
2016	9.10563419755056
2017	7.95937892646157
2018	8.73926465167812
2019	9.11498966218795
2020	9.46989573095143
2021	9.61150284414572