Year	current US$
2000	14.055528726196217
2001	13.568334611231354
2002	13.57370622666686
2003	18.048346669756178
2004	19.55439038265505
2005	22.421160643651454
2006	27.274235118627843
2007	31.854442719055395
2008	36.79122110492867
2009	33.72372641249927
2010	37.94849385471685
2011	41.31883604356496
2012	45.546473588287704
2013	49.68143840175797
2014	49.54759857505412
2015	46.901776408526075
2016	42.17501891823504
2017	41.820158310211475
2018	42.03385467306843
2019	42.55608777203512
2020	43.686270795382036
2021	47.74495789553405