Year Percent 1995-01-01 40.8053000000000000 1996-01-01 46.7369999999999950 1997-01-01 35.5740000000000000 1998-01-01 23.6482000000000000 1999-01-01 18.7467000000000000 2000-01-01 25.2728000000000000 2001-01-01 31.3637000000000000 2002-01-01 31.5504000000000000 2003-01-01 22.3653000000000000 2004-01-01 12.7142000000000000 2005-01-01 18.7846000000000000 2006-01-01 15.2874000000000000 2007-01-01 26.0832000000000000 2008-01-01 14.2500000000000000 2009-01-01 14.4143000000000000 2010-01-01 7.7767000000000000 2011-01-01 7.2706800000000005 2012-01-01 6.2811800000000000 2013-01-01 9.2560899999999990 2014-01-01 13.7913000000000000 2015-01-01 13.5478000000000000 2016-01-01 12.5762000000000000