Year Percent 1996-01-01 11.7909000000000000 1997-01-01 1.4690000000000000 1998-01-01 16.7273000000000000 1999-01-01 18.2028000000000000 2000-01-01 18.2028000000000000 2001-01-01 18.0067000000000000 2002-01-01 8.8299600000000000 2003-01-01 4.8227199999999995 2004-01-01 5.4355600000000000 2005-01-01 5.6971099999999995 2006-01-01 5.4070400000000000 2007-01-01 5.2679199999999990 2008-01-01 5.4679300000000000 2009-01-01 5.2763400000000000 2010-01-01 6.0576099999999995 2011-01-01 6.9108300000000010 2012-01-01 5.4297200000000000 2013-01-01 6.8243500000000000 2014-01-01 4.7081100000000000 2015-01-01 8.7001600000000000 2016-01-01 5.2425100000000000