Year Percent 1996-01-01 54.5455 1997-01-01 63.6364 1998-01-01 61.2903 1999-01-01 69.4445 2000-01-01 73.3333 2001-01-01 64.4007 2002-01-01 75.0405 2003-01-01 57.6923 2004-01-01 50.3884 2005-01-01 45.6128 2006-01-01 70.5882 2007-01-01 44.5455 2008-01-01 56.6246 2009-01-01 57.2650 2010-01-01 70.6667 2011-01-01 68.0162 2012-01-01 73.7989 2013-01-01 65.9575 2014-01-01 40.9091