Year Percent 1995-01-01 73.9157 1996-01-01 65.9973 1997-01-01 96.5879 1998-01-01 66.8831 1999-01-01 52.0173 2000-01-01 47.2294 2001-01-01 55.3786 2002-01-01 56.5396 2003-01-01 89.1729 2004-01-01 74.6356 2005-01-01 64.7714 2006-01-01 65.5154 2007-01-01 71.9393 2008-01-01 49.4029 2009-01-01 49.4004 2010-01-01 41.3991 2011-01-01 39.0780 2012-01-01 28.7371 2013-01-01 27.3156 2014-01-01 22.4965 2015-01-01 31.4312 2016-01-01 23.9398