Year	current international $
2000	3.38540051786252
2001	3.65461385443973
2002	3.01303958609728
2003	2.53107530008814
2004	2.72887695944954
2005	2.86441898393829
2006	3.30461584257756
2007	3.46341694926602
2008	3.59902192985279
2009	3.25795302354636
2010	3.87475806318697
2011	3.69462845878845
2012	3.4589199354758
2013	3.56303430583089
2014	3.48575142451791
2015	3.38681854947953
2016	3.4601144223635
2017	3.44000415729653
2018	3.7648811772672
2019	4.34284762722147
2020	4.36888354272799
2021	4.4479139484566