Year	current US$
2000	28.79333305
2001	27.46539497
2002	31.41914558
2003	38.10652161
2004	41.7527771
2005	42.60778809
2006	44.01630783
2007	48.61966705
2008	53.99885559
2009	50.604702
2010	49.50485611
2011	57.71255493
2012	56.3600235
2013	56.61405563
2014	61.80369186
2015	50.31904221
2016	51.2496109
2017	50.27867889
2018	57.7002182
2019	56.18640518
2020	58.0969696
2021	63.78601837