Year	current US$
2000	87.76255019
2001	89.68544491
2002	93.86516068
2003	74.10219374
2004	75.20181473
2005	112.69811771
2006	103.92869562
2007	109.1241807
2008	119.23552606
2009	119.48970843
2010	130.80037698
2011	133.96921198
2012	133.85151492
2013	130.09578819
2014	128.7535053
2015	131.66737844
2016	134.9031892
2017	132.84299498
2018	122.8795798
2019	130.57839431
2020	118.78939403
2021	131.9011564