Year	current US$
2000	20.549040960717395
2001	19.13976917612179
2002	18.37239873695678
2003	25.588909832105827
2004	29.543316931457618
2005	30.958361272023236
2006	34.26807365194085
2007	37.4993367874117
2008	40.24680538924859
2009	38.22903187093702
2010	42.70576345450536
2011	46.067453829965196
2012	46.078872690879614
2013	47.94507143138454
2014	47.716348687637506
2015	43.72128894351294
2016	39.94341397435605
2017	39.3184407836604
2018	37.831150523603846
2019	36.548835512749484
2020	33.927237159368254
2021	38.957238863492314