Year Percent 1996-01-01 100.0000 1997-01-01 90.2723 1998-01-01 87.6202 1999-01-01 93.4367 2000-01-01 92.4859 2001-01-01 89.1207 2002-01-01 85.7025 2003-01-01 92.9899 2004-01-01 100.0000 2005-01-01 100.0000 2006-01-01 100.0000 2007-01-01 100.0000 2008-01-01 94.7302 2009-01-01 91.2568 2010-01-01 100.0000 2011-01-01 91.3453 2012-01-01 89.9953 2013-01-01 100.0000 2014-01-01 100.0000 2015-01-01 91.8967 2016-01-01 89.8453