Year % 1995 7.21 1997 12.05 2002 8.27 2006 6.32 2007 6.08 2008 5.99 2009 5.76 2010 6.17 2011 5.66 2012 5.66 2013 5.67 2014 5.66 2015 5.67 2016 5.67 2017 5.65 2018 5.67 2019 13.48 2020 5.65 2021 5.82