Year	current US$
2000	0.17040875175900275
2001	0.2881438688676483
2002	0.24120104108863413
2003	0.26592111764211623
2004	0.3750423139480372
2005	0.48069104703492943
2006	0.4960716726508467
2007	0.5606064914472678
2008	0.5359502171334283
2009	0.6579817260609836
2010	0.6651970917418254
2011	0.6875008358632578
2012	0.7420371845693021
2013	0.9041161714495292
2014	1.1304403735070838
2015	0.6956315092907133
2016	0.8034839284061697
2017	0.695777477217011
2018	0.49319821058564445
2019	0.62874043727209
2020	0.5513488567657455
2021	1.9757430433422671