Year % 2007 15.2171156023275 2008 17.4751079368956 2009 3.49856511403874 2010 8.98677777119571 2011 8.91589065952457 2012 10.9781597459474 2013 13.4838819880057 2014 13.7494893821573 2015 11.1603852797878 2016 12.0867086689315 2017 11.6547162298363 2018 11.1582405977525 2019 11.0903739287636 2020 8.48029657275253 2021 10.2572198898278