Year % 1995 98.95 1997 99.12 1998 98.95 1999 98.95 2000 98.95 2001 98.95 2002 98.95 2003 98.95 2004 98.98 2005 98.98 2006 98.98 2007 98.96 2008 98.96 2009 98.96 2010 98.96 2011 98.96 2012 98.96 2013 98.96 2014 99.1 2015 99.1 2016 99.1 2017 99.1 2018 99.1 2019 99.01