Year	current US$
2000	0.06677545
2001	0.41380439
2002	0.37115247
2003	0.36237507
2004	0.96035795
2005	1.64687813
2006	4.08600685
2007	2.50451824
2008	3.3756031
2009	4.59413915
2010	3.13814963
2011	3.48822728
2012	2.64958313
2013	3.66640233
2014	4.14472398
2015	2.87443001
2016	3.42701097
2017	3.5150855
2018	2.85757574
2019	2.55337369
2020	3.04255988
2021	3.10773124