Year % 2007 5.75 2008 5.75 2009 5.75 2010 5.75 2011 5.77 2012 5.77 2013 5.77 2014 5.82 2015 5.81 2016 5.81 2017 5.81 2018 5.81 2019 5.81 2020 5.81 2021 5.85