Year	current US$
2000	15.243395436871742
2001	13.261695214429045
2002	12.433270275502174
2003	19.63963314197111
2004	23.820308911987613
2005	26.4931276768533
2006	31.519759373352958
2007	35.99816507702028
2008	36.77098283971629
2009	39.76467713069972
2010	46.65199495121944
2011	50.68736024078832
2012	49.266037669777404
2013	46.49094473847539
2014	46.37756192775698
2015	42.16709570427705
2016	39.755008413246415
2017	43.344224380947225
2018	43.836214326004296
2019	42.6101070363022
2020	40.85638801460737
2021	46.12393930300635