Year % 1995 2.83 1996 2.85 1997 2.85 1998 2.85 1999 2.85 2000 2.85 2001 2.85 2002 23.51 2003 23.19 2004 22.66 2005 23.03 2006 23.01 2007 22.85 2008 21.87 2009 21.54 2010 21.43 2011 21.37 2012 23.89 2013 23.75 2014 23.56 2015 2.81 2016 2.81 2017 2.83 2018 2.83 2019 2.83 2020 2.83 2021 2.83