Year	current US$
2000	14.21074965
2001	13.45141704
2002	11.91864817
2003	18.43049713
2004	22.51759468
2005	23.24801681
2006	24.56670885
2007	26.97850654
2008	28.52225885
2009	32.79184354
2010	48.4371861
2011	58.63881876
2012	60.82318546
2013	48.96334858
2014	42.12985618
2015	36.32532807
2016	33.17858458
2017	37.06987317
2018	38.16561807
2019	34.17726175
2020	27.87863277
2021	35.21762995