Year	current US$
2000	33.41471586445235
2001	30.80701775696891
2002	29.637743136530663
2003	43.50512753472524
2004	52.15438969358196
2005	58.46114975497113
2006	64.98977959741016
2007	71.95056454014663
2008	76.79234881047837
2009	76.57862775363908
2010	86.59911545643682
2011	94.31927236910411
2012	93.44877744325463
2013	95.31674191225163
2014	92.70862354428763
2015	84.54966659351658
2016	77.78629134590793
2017	79.60465568673592
2018	79.12385402172781
2019	78.3456634800732
2020	74.51017136977495
2021	84.29330340967002