Year Percent 1996-01-01 20.0000 1997-01-01 16.6667 1998-01-01 42.8571 1999-01-01 33.3333 2000-01-01 45.4545 2001-01-01 35.7143 2002-01-01 33.3333 2003-01-01 34.2105 2004-01-01 26.6667 2005-01-01 29.5082 2006-01-01 26.3889 2007-01-01 24.7059 2008-01-01 24.0030 2009-01-01 26.9174 2010-01-01 23.0772 2011-01-01 25.4361 2012-01-01 24.4038 2013-01-01 20.3425 2014-01-01 19.4220