Year Percent of GDP (Units) 2003 19.624 2004 21.754 2005 24.483 2006 26.481 2007 25.662 2008 25.735 2009 28.677 2010 27.956 2011 31.546 2012 2.316 2013 5.785 2014 7.518 2015 9.489 2016 9.734 2017 9.606 2018 9.578 2019 11.681 2020 18.254 2021 20.810 2022 23.359 2023 24.738 2024 26.188 2025 26.823 2026 27.422 2027 27.966 2028 28.468 2029 28.958