Year Percent of GDP (Units) 2001 19.628 2002 15.891 2003 14.945 2004 11.146 2005 7.389 2006 5.065 2007 -1.185 2008 -7.014 2009 -3.572 2010 5.029 2011 7.399 2012 5.433 2013 3.995 2014 3.430 2015 10.762 2016 17.312 2017 20.813 2018 28.135 2019 33.713 2020 31.213 2021 33.642 2022 35.045 2023 31.777 2024 32.531 2025 33.600 2026 34.729 2027 35.668 2028 36.240 2029 37.529