Year Percent 1996-01-01 41.39450 1997-01-01 33.92490 1998-01-01 46.34880 1999-01-01 150.00000 2000-01-01 133.33300 2001-01-01 90.90910 2002-01-01 92.30770 2003-01-01 92.30770 2004-01-01 6.03573 2005-01-01 6.11289 2006-01-01 66.98410 2007-01-01 67.26430 2008-01-01 79.04110 2009-01-01 70.14650 2010-01-01 90.60000 2011-01-01 70.03390 2012-01-01 57.59300 2013-01-01 63.12130 2014-01-01 80.87460 2015-01-01 21.34170 2016-01-01 19.65680