Year	current US$
2000	17.19779961587676
2001	17.22892249312158
2002	18.139462066301743
2003	25.395428668210165
2004	30.423104916736836
2005	34.718121625881025
2006	41.22787817101285
2007	47.80849580869086
2008	56.3517001447924
2009	53.08088217329668
2010	54.66853739510949
2011	59.8171400764046
2012	62.7015444270814
2013	69.18861357598452
2014	70.55554782579817
2015	63.39364845288592
2016	61.04014273186302
2017	58.863581053769224
2018	57.71067725431329
2019	59.35218677527115
2020	59.80583313390534
2021	65.45491330954285