Year Percent 1995-01-01 33.596000000000000 1996-01-01 24.891900000000000 1997-01-01 37.355300000000000 1998-01-01 33.273900000000000 1999-01-01 20.705900000000000 2000-01-01 22.317200000000000 2001-01-01 23.662000000000000 2002-01-01 23.931700000000000 2003-01-01 21.799300000000000 2004-01-01 30.673600000000000 2005-01-01 31.166700000000000 2006-01-01 20.932600000000000 2007-01-01 20.066100000000000 2008-01-01 5.180080000000000 2009-01-01 9.351740000000000 2010-01-01 9.010580000000001 2011-01-01 4.283220000000000 2012-01-01 7.858050000000000 2013-01-01 8.820400000000000 2014-01-01 11.058700000000000 2015-01-01 3.353130000000000 2016-01-01 4.845080000000000