Year % 2008 7.20570269428258 2009 8.29236631508407 2010 8.41416333423251 2011 8.39413224095571 2012 8.34838786391355 2013 8.08716305212902 2014 8.07500041179765 2015 7.88716604842319 2016 7.65624288794926 2017 7.86208174768248 2018 7.92473422099698 2019 8.27361143615705 2020 8.05041926109779 2021 7.43273679069439 2022 9.69044640718479