Year % 2001 25.36 2002 25.25 2004 25.25 2005 25.25 2006 25.25 2007 25.51 2008 25.51 2009 25.51 2010 25.51 2011 25.51 2012 25.62 2013 25.62 2014 25.62 2015 25.62 2016 25.62 2017 25.82 2018 25.82 2019 25.82 2020 25.82 2021 25.82