Year	current US$
2000	149.26223626
2001	134.04896047
2002	117.25208579
2003	158.07970874
2004	201.70539589
2005	194.96815387
2006	196.73021926
2007	206.59178061
2008	199.24171663
2009	207.86110342
2010	257.71590468
2011	284.83471839
2012	272.42874544
2013	253.76111039
2014	233.95411359
2015	205.99184288
2016	191.62526325
2017	223.7319403
2018	237.77703753
2019	223.51658371
2020	181.52783175
2021	222.92398557