Year	current US$
2000	0.98835283
2001	0.76182327
2002	0.77563652
2003	0.49288636
2004	1.56220438
2005	0.258666
2006	0.51356771
2007	0.49076562
2008	0.37752001
2009	1.07255837
2010	2.19816959
2011	3.48605994
2012	1.18803416
2013	0.66435835
2014	1.39876127
2015	0.62700344
2016	0.59143864
2017	0.62085612
2018	0.73755378
2019	1.2406552
2020	1.01906998
2021	0.99353755