Year Percent 1995-01-01 8.4527600000000010 1996-01-01 7.1921899999999990 1997-01-01 6.3520900000000005 1998-01-01 7.9228200000000000 1999-01-01 7.7926300000000000 2000-01-01 13.4090000000000000 2001-01-01 12.8938000000000000 2002-01-01 15.9364000000000000 2003-01-01 14.4503000000000000 2004-01-01 11.9618000000000000 2005-01-01 9.8000500000000000 2006-01-01 7.9159500000000000 2007-01-01 6.7851100000000000 2008-01-01 4.9070100000000000 2009-01-01 4.8462300000000000 2010-01-01 5.6713400000000000 2011-01-01 5.5162900000000010 2012-01-01 2.8460700000000000 2013-01-01 4.1428000000000000 2014-01-01 8.0955500000000000 2015-01-01 10.1897000000000000 2016-01-01 10.9065000000000000