Year % 1995 2.96 1996 2.95 1997 2.95 1998 2.95 1999 2.95 2000 2.95 2001 2.95 2002 8.84 2003 8.3 2004 7.49 2005 7.16 2006 6.91 2007 6.57 2008 6.23 2009 6.17 2010 6.41 2011 6.73 2012 7.84 2013 7.47 2014 6.86 2015 3.06 2016 3.06 2017 3.08 2018 3.08 2019 3.08 2020 3.08 2021 3.08