Year % 2006 39.32219947480913 2007 49.68333102628261 2008 43.44231963245573 2009 35.47681443350548 2010 47.22717597933087 2011 36.44900678245644 2012 42.536066900166844 2013 38.98260017374874 2014 34.29038869716915 2015 41.18878865681601 2016 35.62082821111267 2017 33.31170448718213 2018 25.263008108969753 2019 30.167257059979896 2020 41.48382706507499 2021 30.657733510057028 2022 27.628190316452066