Year	current US$
2000	56.51635051274202
2001	54.648578362213186
2002	56.72288985209232
2003	64.6189711104692
2004	70.51218741110146
2005	75.2733324613832
2006	79.88143353330405
2007	84.23375738706645
2008	97.45935770038744
2009	105.63830583394233
2010	118.57586517567638
2011	139.7204478478499
2012	151.66199572503987
2013	152.74750588488118
2014	155.84081863690676
2015	154.09432568584558
2016	161.25959078007088
2017	172.1986436634983
2018	189.3933518049134
2019	195.44425514559668
2020	199.952986018884
2021	222.53711567600232