Year Percent of GDP (Units) 1998 54.397 1999 56.039 2000 34.686 2001 35.230 2002 31.198 2003 27.635 2004 25.487 2005 25.515 2006 21.245 2007 18.709 2008 30.885 2009 35.067 2010 40.805 2011 39.550 2012 42.207 2013 42.499 2014 45.859 2015 44.991 2016 43.548 2017 37.438 2018 33.769 2019 32.081 2020 36.036 2021 34.586 2022 29.623 2023 28.118 2024 29.699 2025 30.225 2026 31.096 2027 31.918 2028 32.433 2029 32.388