Year Percent 1996-01-01 11.2173 1997-01-01 11.2173 1998-01-01 129.5450 1999-01-01 114.8150 2000-01-01 114.8150 2001-01-01 114.8150 2002-01-01 114.8150 2003-01-01 114.8150 2004-01-01 114.8150 2005-01-01 72.7273 2006-01-01 79.7980 2007-01-01 79.7980 2008-01-01 79.7980 2009-01-01 79.7980 2010-01-01 79.7980 2011-01-01 79.7980 2012-01-01 93.9163 2013-01-01 97.7148 2014-01-01 37.5000 2015-01-01 32.8557 2016-01-01 28.2107