what are all of the years?
2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
what about their changes?
+4.6%, -0.9%, -4.5%, -14.3%, +1.7%, +39.1%, +10.7%, -18.7%
and which change occurred during 2011?
+39.1%