Year % 2001 11.750606757002172 2002 11.331417191495044 2003 13.735053103260467 2004 18.29573419910319 2005 19.055519075529343 2006 18.600728849802728 2007 18.237494038804247 2008 15.862545085381196 2009 14.520091735173052 2010 17.147900247389842 2011 19.897963982133287 2012 19.036211959218804 2013 17.9952886789035 2014 16.236313111380046 2015 19.896154203705294 2016 22.317901925737715 2017 19.73472197474562 2018 19.564268478809467 2019 22.309835794942487 2020 20.781186032330695 2021 24.35770144912729 2022 27.974119951454007 2023 27.095461792997614