Year % 2008 8.52413818308396 2009 8.09947375410093 2010 7.51181119049074 2011 7.77401945560563 2012 7.5283570351795 2013 8.15850455733114 2014 10.2605395419742 2015 11.1521213582355 2016 11.5630790522057 2017 11.5458297083325 2018 10.6882483889617 2019 10.6112869811398 2020 9.52283689786663 2021 9.16603251735785 2022 9.07114402173714