Year	current US$
2000	27.007497314824718
2001	28.522770544858645
2002	27.09152729211658
2003	29.400457478662755
2004	32.547074198491124
2005	38.14099561218948
2006	41.122568972293955
2007	46.92754271270747
2008	50.005786912058795
2009	47.93093374871533
2010	55.45882271592298
2011	59.96039609390895
2012	61.629734144647784
2013	64.27247101313752
2014	61.95420999912564
2015	62.06088793370406
2016	60.771500837707904
2017	57.64551641741742
2018	58.39827896515334
2019	58.006706417953225
2020	55.765028288327336
2021	63.634310834996626