Year Percent of GDP (Units) 1992 27.105 1993 26.696 1994 24.856 1995 23.508 1996 27.213 1997 29.240 1998 27.717 1999 24.599 2000 24.173 2001 26.989 2002 28.120 2003 26.737 2004 24.694 2005 24.035 2006 25.396 2007 23.507 2008 22.835 2009 26.195 2010 25.548 2011 26.504 2012 26.017 2013 25.909 2014 30.189 2015 30.644 2016 32.082 2017 28.114 2018 32.478 2019 30.392 2020 31.612 2021 34.346 2022 33.481 2023 30.129 2024 31.782 2025 31.805 2026 31.448 2027 31.187 2028 31.097 2029 30.923