Year Percent of GDP (Units) 2014 17.203 2015 18.124 2016 20.459 2017 21.559 2018 21.264 2019 21.308 2020 24.242 2021 22.750 2022 21.151 2023 21.856 2024 22.148 2025 21.997 2026 20.828 2027 20.261 2028 20.227 2029 20.207