Year	current US$
2000	33.62632953597078
2001	34.75372740675726
2002	32.24882797211638
2003	35.70760746973922
2004	40.225900100090854
2005	46.37117500451594
2006	50.08247526092628
2007	57.50580779398832
2008	61.89394473315455
2009	60.16384625074012
2010	70.5088016264973
2011	77.18370539346286
2012	79.48530111346119
2013	82.34309293991991
2014	79.42622077472527
2015	78.86551532500437
2016	78.17211567080112
2017	78.10376772211839
2018	79.69509957637352
2019	78.43113797851784
2020	74.28864325618397
2021	85.01063265031964