Year % 2012 3.84065495492612 2013 4.16835116872092 2014 4.29503163043564 2015 5.25704228960036 2016 5.7497855510536 2017 5.38923860864114 2018 6.29175234515156 2019 6.64578493419695 2020 6.06599474798884 2021 5.64914566922866