Year	current US$
2000	19.312120376767794
2001	18.38267937780199
2002	18.723221984668346
2003	26.542892495014037
2004	29.638581732521548
2005	35.57912984649692
2006	43.44923977249986
2007	47.23574161859887
2008	52.26307403860522
2009	47.96585686090681
2010	53.97551387384416
2011	58.48859054487975
2012	63.64497614697246
2013	69.69534375186808
2014	73.22850710138219
2015	69.68414395166279
2016	64.74407892306856
2017	62.091894897693315
2018	60.03823922900815
2019	60.24494310057038
2020	62.1169071484222
2021	72.81964914104795