Year % 2008 11.6621892334669 2009 9.47547250112194 2010 10.527852869693 2011 9.7045106578164 2012 10.1744932577921 2013 11.8583980195046 2014 13.1863227430094 2015 13.3085968541513 2016 13.2607369527477 2017 14.2099582448356 2018 14.464424022524 2019 14.0126998228127 2020 14.4622011858785 2021 13.5378071585871 2022 9.13242292480511