Year Percent 1998-01-01 53.5000 1999-01-01 51.4000 2000-01-01 59.1000 2001-01-01 59.1000 2002-01-01 59.1000 2003-01-01 18.3000 2004-01-01 26.8000 2005-01-01 26.8000 2006-01-01 26.8000 2007-01-01 26.8000 2008-01-01 26.8000 2009-01-01 26.8000 2010-01-01 26.8000 2011-01-01 67.4439 2012-01-01 30.8880 2013-01-01 43.9442 2014-01-01 42.0842 2015-01-01 36.7097