Year	current US$
2000	11.48470462
2001	11.55863846
2002	12.19123831
2003	15.77626455
2004	20.31762259
2005	20.69705104
2006	27.25202257
2007	34.22546477
2008	32.71954909
2009	37.9729649
2010	38.2534475
2011	49.55871459
2012	53.44950413
2013	58.09396627
2014	61.82370058
2015	58.27423987
2016	58.11934229
2017	58.37336427
2018	81.74650542
2019	75.94017276
2020	68.09277674
2021	69.72695263