Year	current US$
2000	39.01110791
2001	41.93563323
2002	47.12820429
2003	45.43967558
2004	48.29883856
2005	52.7971463
2006	65.14316384
2007	79.6061981
2008	97.66290713
2009	99.53776083
2010	112.77809186
2011	126.27782101
2012	144.01991953
2013	139.89966526
2014	133.28786927
2015	120.64666192
2016	118.75687325
2017	125.20410248
2018	139.2036172
2019	135.31042769
2020	120.24535781
2021	143.87308565