Year % 2000 14.34 2001 14.66 2004 14.73 2005 14.73 2006 14.73 2007 14.73 2008 14.73 2014 15.2 2015 15.2 2016 10.22 2017 10.22 2018 10.2 2019 10.16 2020 10.18 2021 10.18