Year	current US$
2000	3.93629617
2001	3.91793405
2002	3.90723702
2003	3.88894768
2004	2.52912446
2005	2.28740937
2006	10.41057885
2007	7.53676804
2008	16.61416765
2009	5.11880792
2010	4.45477301
2011	0.03420945
2012	0.47175572
2013	0.95373557
2014	1.30489579
2015	1.23820976
2016	1.1169916
2017	0.87415068
2018	1.15768592
2019	0.44985637
2020	3.33393323
2021	16.89894813