Year % 2010 3.02417678719897 2011 2.66474232206443 2012 2.66295928968193 2013 2.35577463212102 2014 2.21062374459902 2015 2.90153478146058 2016 3.12047082267029 2017 3.29677628315394 2018 3.14691690745232 2019 3.10029841690629 2020 3.07849300396397 2021 2.84286314441354 2022 3.51982420722678