Year	current US$
2003	0.44324257
2004	0.54960188
2005	0.74841939
2006	1.06649168
2007	1.57120616
2008	1.25360391
2009	1.62846798
2010	0.68905329
2011	0.68215076
2012	0.53750106
2013	0.23225492
2014	2.16387174
2015	0.35077613
2016	1.46808383
2017	0.34031773
2018	0.79050773
2019	1.50734988
2020	1.69197262
2021	1.13383453