Year Percent of GDP (Units) 1993 25.742 1994 26.604 1995 26.408 1996 27.487 1997 30.726 1998 31.623 1999 25.904 2000 28.475 2001 29.582 2002 32.941 2003 35.198 2004 34.655 2005 33.356 2006 39.832 2007 40.008 2008 31.635 2009 21.010 2010 21.589 2011 25.568 2012 29.356 2013 27.229 2014 27.151 2015 25.094 2016 25.203 2017 26.463 2018 28.030 2019 26.541 2020 29.697 2021 31.046 2022 30.713 2023 26.674 2024 25.148 2025 25.105 2026 25.030 2027 24.916 2028 24.762 2029 24.568