Year Percent of GDP (Units) 1998 38.498 1999 38.408 2000 43.121 2001 41.276 2002 42.010 2003 43.792 2004 40.754 2005 37.411 2006 37.065 2007 34.195 2008 34.254 2009 35.961 2010 36.695 2011 35.687 2012 37.616 2013 39.756 2014 41.281 2015 45.832 2016 50.399 2017 53.866 2018 56.449 2019 59.085 2020 67.965 2021 68.232 2022 68.415 2023 73.262 2024 72.971 2025 70.316 2026 67.546 2027 65.390 2028 63.355 2029 61.703