Year	current US$
2000	0
2001	0
2002	0
2003	0
2004	1
2005	0
2006	0
2007	1
2008	1
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	2