Year Percent 2002-01-01 31.746000000000000 2003-01-01 32.227500000000000 2004-01-01 18.085100000000000 2005-01-01 18.886200000000000 2006-01-01 9.120519999999999 2007-01-01 18.905500000000000 2008-01-01 18.905500000000000 2009-01-01 18.905500000000000 2010-01-01 18.905500000000000 2011-01-01 22.543400000000000 2012-01-01 25.773200000000000 2013-01-01 19.421500000000000 2014-01-01 13.407800000000000 2015-01-01 13.472000000000001 2016-01-01 15.457600000000000