Year	current US$
2000	53.11489134071407
2001	60.20819128138089
2002	66.61336810797164
2003	82.31288342951268
2004	107.17984957511769
2005	119.91091296215218
2006	133.31136083378024
2007	168.78326137457574
2008	207.82322670467022
2009	188.4633543700849
2010	191.93491583246183
2011	209.50898163921457
2012	200.31163458728278
2013	204.75030698201255
2014	204.53896737803433
2015	181.51874038182834
2016	189.28595997352096
2017	208.28006873063742
2018	220.35227369031588
2019	224.55007426902256
2020	231.00645960481066
2021	276.90878347038654
