Year % 2010 15.0798799393914 2011 13.5639823510104 2012 15.6129672176544 2013 16.4511104573787 2014 10.8218554441212 2015 12.0626314465578 2016 25.4531339058565 2017 26.5927107372185 2018 27.0417009043029 2019 27.3758216756443 2020 26.266746291981 2021 20.9222699816233