Year	current US$
2000	161.23510742
2001	171.82507324
2002	175.38461304
2003	172.24946594
2004	186.10636902
2005	196.46897888
2006	199.64881897
2007	219.40531921
2008	289.98577881
2009	333.80767822
2010	319.84109497
2011	338.34609985
2012	342.94042969
2013	320.86730957
2014	306.806427
2015	303.23452759
2016	279.29806519
2017	289.57980347
2018	289.53860474
2019	294.18927002
2020	284.53439331
2021	299.07235718