Year Number 2005-01-01 4.8323 2006-01-01 5.1334 2007-01-01 13.2333 2008-01-01 18.9095 2009-01-01 27.0948 2010-01-01 29.4460 2011-01-01 36.8542 2012-01-01 38.7963 2013-01-01 64.7615