Year	current US$
2000	12.677338699388189
2001	14.06706721932707
2002	14.14362527458379
2003	15.089012460871631
2004	17.620817812943958
2005	19.644946417279893
2006	21.144159036945396
2007	25.387676770374046
2008	25.592385613670345
2009	25.632045108432695
2010	29.83643762971978
2011	30.96014733138691
2012	31.63690064646744
2013	38.19847700558062
2014	38.891885943964944
2015	39.511702029364606
2016	40.07860662461071
2017	36.730194350294035
2018	36.76546194403983
2019	37.48146550075129
2020	38.58543475376416
2021	44.746005828155134