Year	current US$
2000	10.211345112399536
2001	9.785504457980073
2002	10.279731785992627
2003	13.129198156050471
2004	14.238944435992996
2005	16.34669690324925
2006	19.624842476583893
2007	22.22230169558544
2008	25.316382729144152
2009	24.323437522089137
2010	26.478914459739453
2011	28.369958227622607
2012	29.441315957542496
2013	32.19386213322269
2014	33.47771052344716
2015	33.11268794740496
2016	31.959571434460667
2017	30.541798806995732
2018	29.39895452643849
2019	29.82255409610623
2020	30.70552028869108
2021	34.24269742475035