Year	current US$
2000	1.34637394
2001	1.40126664
2002	1.03285168
2003	0.75181274
2004	1.77323403
2005	1.01670251
2006	1.80019983
2007	0.67612344
2008	0.86198351
2009	0.51699932
2010	0.47646414
2011	0.47428331
2012	0.26395188
2013	0.33880325
2014	0.78067456
2015	0.48283819
2016	0.74643003
2017	0.56818781
2018	0.46956713
2019	0.2575569
2020	0.74781412
2021	2.13279924