Year	current US$
2000	25.85005971
2001	28.6095061
2002	31.52313115
2003	34.48301257
2004	37.93130194
2005	42.28110941
2006	46.35767704
2007	50.71555063
2008	63.57181084
2009	71.8307205
2010	77.25225558
2011	96.53838869
2012	111.94188886
2013	125.84286219
2014	132.73378551
2015	138.17454881
2016	143.18999361
2017	158.83396972
2018	180.46921254
2019	190.1080505
2020	202.98193268
2021	230.62191231