Year Percent of GDP (Units) 2004 -1.947 2005 30.788 2006 25.332 2007 18.712 2008 34.799 2009 10.578 2010 23.736 2011 32.979 2012 27.158 2013 28.331 2014 28.565 2015 17.984 2016 13.137 2017 11.329 2018 16.748 2019 14.340 2020 1.746 2021 21.177 2022 33.897 2023 16.453 2024 10.233 2025 9.057 2026 7.318 2027 6.383 2028 5.196 2029 4.510