Year	current US$
2000	17.035927992203394
2001	18.310756116863576
2002	18.575851195810827
2003	20.10117418397283
2004	22.772678192593236
2005	24.932862342031864
2006	27.279659398594983
2007	33.15345324193316
2008	35.05192577312584
2009	35.27628356243988
2010	41.10894722401462
2011	43.98822019811061
2012	44.81510575375625
2013	51.047412857497235
2014	52.71638161133798
2015	54.23543233019825
2016	56.66043565213951
2017	55.443450511808486
2018	56.388392857672336
2019	58.50368405142013
2020	61.272469339701274
2021	70.17662494970703