Year % 1995 0 2000 5.17 2001 5.14 2002 8.02 2003 6.14 2006 6.13 2007 6.13 2008 6.23 2009 6.23 2010 6.15 2011 6.08 2012 6.08 2013 6.08 2014 6.06 2015 8.29 2016 7.8 2017 7.54 2018 7.56 2019 11.07 2020 7.62 2021 7.97