Year	current US$
2000	29.29968273377249
2001	29.115428376824664
2002	26.066368055958353
2003	29.056674069413603
2004	32.53361379477931
2005	37.18410207744578
2006	42.31997202836733
2007	49.26313687120306
2008	55.95940012602249
2009	58.328061710512856
2010	65.42626444797959
2011	74.47339841273251
2012	78.83075385648307
2013	82.25493217221525
2014	84.21531992454698
2015	84.07728775789532
2016	82.35187182450876
2017	88.30553679675326
2018	85.79126536885737
2019	85.26065306816501
2020	90.65665166148767
2021	101.66081354244471