Year Percent 2001-01-01 7.782870000000000 2002-01-01 9.768870000000000 2003-01-01 9.122180000000000 2004-01-01 9.884160000000001 2005-01-01 9.922440000000000 2006-01-01 11.182700000000000 2007-01-01 13.988300000000000 2008-01-01 34.527700000000000 2009-01-01 39.215900000000000 2010-01-01 25.323500000000000 2011-01-01 18.106500000000000 2012-01-01 14.930700000000000 2013-01-01 9.871180000000000 2014-01-01 6.251130000000000 2015-01-01 10.436300000000000 2016-01-01 10.858800000000000