Year % gross 2012 66.5299987792969 2014 87.1485900878906 2015 89.3871002197266 2016 92.4426498413086 2017 93.3066177368164 2018 93.7090377807617 2019 92.8349609375 2020 93.5956192016602 2021 89.9790191650391