Year Percent 1992 8.78 1993 8.78 1994 8.78 1995 8.78 1996 8.78 1997 8.78 1998 8.78 1999 8.78 2000 8.78 2001 8.78 2002 8.78 2003 8.78 2004 8.78 2005 8.78 2006 8.78 2007 8.78 2008 8.78 2009 8.78 2010 8.78 2011 8.78 2012 8.78 2013 8.78 2014 8.78 2015 8.78