Year Percent 1995-01-01 32.16000 1996-01-01 30.51500 1997-01-01 32.32000 1998-01-01 27.49775 1999-01-01 27.86000 2000-01-01 29.81000 2001-01-01 29.38000 2002-01-01 31.85000 2003-01-01 25.44000 2004-01-01 26.63000 2005-01-01 25.35500 2006-01-01 28.09000 2007-01-01 32.26000 2008-01-01 18.41000 2009-01-01 20.58510 2010-01-01 20.52500 2011-01-01 19.08000 2012-01-01 18.82500 2013-01-01 15.93095 2014-01-01 15.63000 2015-01-01 17.28500