Year Percent of GDP (Units) 1998 32.259 1999 30.700 2000 33.758 2001 34.456 2002 34.491 2003 33.949 2004 34.203 2005 37.055 2006 36.843 2007 37.527 2008 36.560 2009 32.707 2010 32.311 2011 34.693 2012 34.411 2013 33.490 2014 33.868 2015 31.887 2016 32.916 2017 33.361 2018 35.544 2019 35.682 2020 35.164 2021 35.440 2022 34.164 2023 34.538 2024 35.617 2025 35.879 2026 36.277 2027 36.308 2028 36.704 2029 37.097