Year	current US$
2000	59.968994203021694
2001	55.35242364775958
2002	55.49745522840858
2003	61.452749528857574
2004	69.60953479391921
2005	82.17466728969167
2006	83.0044301271341
2007	92.01076782735304
2008	87.4423345705211
2009	77.84320535916386
2010	84.30875383945731
2011	93.91588420181824
2012	98.23061617695981
2013	100.24089909495895
2014	105.83503226797313
2015	106.8090218351845
2016	113.04590445368844
2017	120.08031017112273
2018	135.56641938380318
2019	141.4827245538509
2020	139.46224109539403
2021	136.42140767803843