Year	current US$
2000	0.17052098977785557
2001	0.22351176592838004
2002	0.24018898005841804
2003	0.2635328570633331
2004	0.41087034715871196
2005	0.3236676464226077
2006	0.39290164105462405
2007	0.47289732553878466
2008	0.4478113918581074
2009	0.583553410993439
2010	0.7363241899383265
2011	0.8442103994958667
2012	0.6582966915314393
2013	0.576427006052339
2014	0.6446304931435278
2015	0.465000832264142
2016	0.3851868936442064
2017	0.3633232417347504
2018	0.34962373918691125
2019	0.46313689599243385
2020	0.5304346113888465
2021	1.0424401149696316