Year Percent 1995-01-01 34.07000 1996-01-01 35.93650 1997-01-01 31.98270 1998-01-01 27.42470 1999-01-01 23.62780 2000-01-01 42.51130 2001-01-01 24.84450 2002-01-01 37.45660 2003-01-01 25.44410 2004-01-01 15.75230 2005-01-01 18.47420 2006-01-01 34.44540 2007-01-01 31.64050 2008-01-01 28.56260 2009-01-01 21.02900 2010-01-01 24.42280 2011-01-01 22.31400 2012-01-01 14.42210 2013-01-01 8.52645 2014-01-01 13.85110 2015-01-01 14.33420 2016-01-01 9.48438