Year % 2000 8.03 2001 8.11 2004 8.11 2005 8.18 2006 8.18 2007 8.18 2008 8.18 2014 8.17 2015 8.17 2016 7.91 2017 7.91 2018 7.91 2019 7.86 2020 7.86 2021 7.86