Year Percent of GDP 2009 13.297 2010 13.926 2011 10.717 2012 10.766 2013 17.736 2014 14.018 2015 15.074 2016 14.411 2017 17.424 2018 17.771 2019 17.482 2020 18.127 2021 18.402 2022 18.926 2023 19.487 2024 20.056