Year % of tax revenue 2011 20.67757963818776 2012 22.84666434487579 2013 22.33857870850943 2014 20.767014431130836 2015 20.033099131717393 2016 20.151922535584145 2017 8.3617306224826 2018 21.85796440582498 2019 20.83326534167446 2020 22.951210552319495 2022 24.798103054926877