Year	current US$
2000	0.44471251
2001	0.50506042
2002	0.62937968
2003	0.89461603
2004	1.17614271
2005	1.41518547
2006	1.72428394
2007	2.28157949
2008	2.98401268
2009	3.09084723
2010	1.83410847
2011	2.95795631
2012	3.6951311
2013	6.65164695
2014	6.4466797
2015	5.81084776
2016	7.97524724
2017	7.94162438
2018	5.11742339
2019	4.57205282
2020	8.17367385
2021	8.75908325