Year Percent of GDP (Units) 2008 23.835 2009 21.264 2010 21.525 2011 17.758 2012 18.571 2013 20.638 2014 20.377 2015 22.043 2016 23.451 2017 25.285 2018 26.658 2019 27.035 2020 36.130 2021 37.850 2022 37.290 2023 37.220 2024 36.829 2025 37.037 2026 37.153 2027 37.193 2028 37.150 2029 37.029