Year Percent of GDP (Units) 2000 17.689 2001 16.269 2002 16.084 2003 15.360 2004 10.692 2005 8.110 2006 3.819 2007 5.129 2008 8.036 2009 15.277 2010 22.250 2011 25.914 2012 27.699 2013 28.568 2014 28.355 2015 28.260 2016 26.756 2017 25.862 2018 26.244 2019 28.576 2020 37.759 2021 40.549 2022 39.097 2023 39.699 2024 42.318 2025 45.753 2026 48.756 2027 51.246 2028 53.497 2029 55.691