Year	current US$
2000	11.22799778
2001	11.21350384
2002	12.65094852
2003	15.46995354
2004	16.90148544
2005	17.79439926
2006	18.60928154
2007	22.96606827
2008	27.6753788
2009	29.0416832
2010	31.36204338
2011	35.2552681
2012	36.26974869
2013	40.56192398
2014	43.02396011
2015	37.41205215
2016	51.94157028
2017	52.88779449
2018	53.81824493
2019	50.15758133
2020	54.17138672
2021	54.14671707