Year	current US$
2000	33.455079604436996
2001	30.85037216635014
2002	29.679461470050065
2003	43.55090281558017
2004	52.20426499942683
2005	58.510773263625325
2006	65.03987273237824
2007	71.99194958329149
2008	76.8264327821179
2009	76.60549779281622
2010	86.63948627856873
2011	94.35793085383766
2012	93.4981205539287
2013	95.36388971643773
2014	92.76183460307217
2015	84.60089432262251
2016	77.84790315030423
2017	79.66468654868022
2018	79.18724914492167
2019	78.40671641127659
2020	74.57151760765176
2021	84.3473788668171