Year	current US$
2000	75.49331322
2001	70.89947089
2002	82.36043458
2003	96.33421285
2004	105.17841092
2005	114.34157451
2006	125.32852129
2007	147.99546954
2008	162.47652795
2009	165.0582422
2010	73.41954577
2011	97.01640361
2012	86.6090928
2013	93.18040789
2014	91.70390865
2015	75.87675399
2016	72.31560005
2017	70.03810447
2018	84.86812478
2019	81.48427713
2020	76.40690627
2021	87.08228764