Year Percent 1995-01-01 80 1996-01-01 83 1997-01-01 83 1998-01-01 86 1999-01-01 88 2000-01-01 88 2001-01-01 88 2002-01-01 88 2003-01-01 88 2004-01-01 88 2005-01-01 88 2006-01-01 89 2007-01-01 89 2008-01-01 100 2009-01-01 100 2010-01-01 100 2011-01-01 100 2012-01-01 100 2013-01-01 100