Year	current US$
2003	0.9138337857839566
2004	0.9272139680270881
2005	1.0869002102876963
2006	1.7906265512503863
2007	2.159886186953649
2008	2.390874666407452
2009	2.5893984124319247
2010	2.870808815107342
2011	2.797494714723938