Year Percent 2002-01-01 0.039999999 2003-01-01 0.017000001 2004-01-01 0.039999999 2005-01-01 0.175999999 2006-01-01 0.483999997 2007-01-01 0.537999988 2008-01-01 0.381999999 2009-01-01 0.354000002 2010-01-01 0.472999990 2011-01-01 0.513999999 2012-01-01 0.708999991 2013-01-01 0.629999995