Year	constant 2010 US$
2009	418.894220134344
2010	401.531244648525
2011	398.807848906499
2012	431.513078598048
2013	233.444262620318
2014	236.616279453504
2015	239.527236341426
2016	252.505377228786
2017	274.064112271163