Year Percent 1999-01-01 91.1617 2000-01-01 88.7885 2001-01-01 92.4817 2002-01-01 100.0000 2003-01-01 100.0000 2004-01-01 79.7508 2005-01-01 78.4388 2006-01-01 77.6144 2007-01-01 86.4350 2008-01-01 88.0975 2009-01-01 83.4344 2010-01-01 89.8054 2011-01-01 86.6062 2012-01-01 95.8550 2013-01-01 100.0000 2014-01-01 100.0000 2015-01-01 79.1197 2016-01-01 79.9509