Year	current US$
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0.0073551
2008	0.00437944
2009	0.00337074
2010	0.00101784
2011	0.00134655
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0.05290717
2021	0.02063963