Year Percent 1995-01-01 16.11510 1996-01-01 16.12910 1997-01-01 11.16190 1998-01-01 12.59740 1999-01-01 14.22180 2000-01-01 11.54420 2001-01-01 12.77970 2002-01-01 12.48950 2003-01-01 16.58060 2004-01-01 16.23590 2005-01-01 20.24610 2006-01-01 24.12740 2007-01-01 19.44900 2008-01-01 8.58822 2009-01-01 8.25458 2010-01-01 5.46034 2011-01-01 7.61263 2012-01-01 7.19057 2013-01-01 6.51339 2014-01-01 7.08172 2015-01-01 4.76277 2016-01-01 5.63591