Year % 2011 1.9042059394074 2012 6.72327958982541 2013 4.84439636539416 2014 9.36516719804562 2015 8.39790781352825 2016 8.8585217562526 2017 8.89566055291347 2018 9.88732966644866 2019 8.90213335235847 2020 7.73754873370445 2021 7.96907960398037