Year Percent 2003-01-01 0.20 2004-01-01 0.77 2005-01-01 1.25 2006-01-01 1.77 2007-01-01 2.29 2008-01-01 2.94 2009-01-01 3.94 2010-01-01 4.56 2011-01-01 5.36 2012-01-01 6.45 2013-01-01 7.48 2014-01-01 8.40 2015-01-01 9.39 2016-01-01 10.39