Year	current US$
2000	1.14804298
2001	0.64383441
2002	1.63997527
2003	1.6024516
2004	1.33434634
2005	3.21439502
2006	2.91077088
2007	4.05184064
2008	3.63068651
2009	7.49753647
2010	3.75671306
2011	5.4683263
2012	5.14685942
2013	5.56258561
2014	6.67578608
2015	7.33449281
2016	6.64968237
2017	8.6958473
2018	25.26477245
2019	9.46980409
2020	14.40061863
2021	15.57202062