Year Percent of GDP (Units) 2012 5.807 2013 15.160 2014 35.684 2015 55.234 2016 124.822 2017 117.088 2018 68.943 2019 42.671 2020 49.169 2021 52.161 2022 39.898 2023 54.114 2024 48.242 2025 42.100 2026 37.708 2027 33.912 2028 28.977 2029 21.254