Year % 2013 2.66177705858124 2014 3.24436675637472 2015 4.30632739093896 2016 5.7261126057554 2017 12.6350461122505 2018 11.1183361707449 2019 10.1582280493631 2020 9.82505980059783 2021 10.6046068968098