Year % 2010 9.25423745220691 2011 9.44019549527723 2012 9.55151655888075 2013 10.2249569689872 2014 8.91289884359989 2015 9.44007218414204 2016 10.8283059553168 2017 12.3645924301501 2018 14.1831450300624 2019 9.87031380207947 2020 8.96927105568948 2021 10.0259673385746