Year	current US$
2000	10.452205633108276
2001	9.752327901093016
2002	9.086516113896263
2003	14.19589493418202
2004	17.663109129212668
2005	19.942713896115716
2006	23.071875280953538
2007	25.885180359546776
2008	26.85177781023591
2009	27.96721001000857
2010	32.27991708752158
2011	35.439491196790904
2012	34.952468627031756
2013	33.558050833016246
2014	33.10360757610227
2015	30.435191697308294
2016	28.11688016380336
2017	30.618774898047626
2018	31.307809219588364
2019	31.133158997391902
2020	30.63325378881675
2021	33.96424445933338