Year Percent of GDP (Units) 2006 16.251 2007 14.260 2008 10.770 2009 6.897 2010 6.452 2011 5.569 2012 8.559 2013 9.425 2014 11.190 2015 13.424 2016 14.472 2017 16.379 2018 17.137 2019 17.669 2020 22.487 2021 21.581 2022 20.129 2023 17.449 2024 18.403 2025 19.081 2026 19.832 2027 20.366 2028 21.182 2029 21.468