Year	current US$
2002	14.52033009
2003	15.33316076
2004	18.11380963
2005	19.82707758
2006	22.21764663
2007	25.57503324
2008	30.13865716
2009	31.4848611
2010	36.79654596
2011	38.35863995
2012	39.18983324
2013	40.56694031
2014	43.97205304
2015	47.07526211
2016	46.7139328
2017	50.5048086
2018	54.37316713
2019	57.02542754
2020	60.06667124
2021	62.79028478