Year	current US$
2000	14.39423758
2001	14.84643581
2002	14.75219818
2003	14.85366417
2004	15.08901002
2005	16.53455878
2006	18.04726359
2007	19.52045164
2008	23.60918997
2009	26.86879125
2010	33.27463219
2011	38.75906809
2012	46.25685864
2013	54.10491594
2014	55.07428357
2015	53.26613616
2016	57.70177172
2017	53.38550667
2018	50.67777075
2019	57.3820112
2020	51.45138017
2021	62.06513298