Year	current US$
2000	1.38587657
2001	2.96917984
2002	2.02052884
2003	2.44943158
2004	3.63845831
2005	3.51317494
2006	5.36908528
2007	5.84236948
2008	5.8910152
2009	7.01062778
2010	5.78087879
2011	7.49798721
2012	8.78740563
2013	8.27646024
2014	7.65774614
2015	8.84567914
2016	9.87755747
2017	10.26918189
2018	7.14137452
2019	14.38358587
2020	9.21337361
2021	26.18286844