Year	current US$
2000	2.62413103
2001	1.60985411
2002	2.1529741
2003	2.7474428
2004	2.8883348
2005	7.51926156
2006	4.94234176
2007	7.07035054
2008	5.6311631
2009	4.28863144
2010	2.37098954
2011	2.85849615
2012	1.09093849
2013	0.97069365
2014	2.34283504
2015	1.54698939
2016	1.43669608
2017	1.17983548
2018	2.58218209
2019	1.18342532
2020	24.68181111
2021	9.33751067