Year	current US$
2000	60.79081298
2001	58.12931483
2002	43.68800316
2003	46.01674517
2004	58.11841515
2005	62.95653574
2006	78.38915071
2007	104.25505695
2008	147.74698256
2009	131.52602421
2010	154.59601778
2011	191.3070121
2012	194.70715846
2013	217.44906477
2014	228.21585363
2015	205.94133103
2016	201.7774427
2017	218.6631482
2018	231.66530658
2019	223.10865794
2020	189.60794103
2021	211.24647435