Year	current US$
2003	0.04435697
2004	0.76597318
2005	2.08265977
2006	3.30951342
2007	7.01358823
2008	1.74759012
2009	1.30074666
2010	0.64935843
2011	1.13809574
2012	0.55446858
2013	0.6568836
2014	0.75706928
2015	0.94109284
2016	0.55422673
2017	0.7096858
2018	1.14350736
2019	1.27595171
2020	0.74744907
2021	1.86572793