Year	current US$
2000	85.74742438
2001	95.44868461
2002	94.76037663
2003	97.43613468
2004	103.2988976
2005	105.62284902
2006	108.40480541
2007	126.13920008
2008	149.17362284
2009	149.72052957
2010	143.68475806
2011	143.04291839
2012	144.99678229
2013	136.87989147
2014	141.07505762
2015	135.71516068
2016	135.77322477
2017	115.54740797
2018	149.78128592
2019	149.83284494
2020	118.53661347
2021	114.66469294