Year % of tax revenue 2015 0.1332899002526139 2016 0.14201109129760953 2017 0.11091921453327039 2018 0.08839112491282113 2019 0.12747805257645603 2020 0.09387503657840503 2021 0.01623329956106254 2022 0.060744115070352996