Year % 2013 6.2023356485251 2014 6.06487516391056 2015 6.07175325484793 2016 9.44234465807295 2017 10.6755859578393 2018 11.5550664603898 2019 9.89902696380351 2020 9.37968228236148 2021 9.2073913241176