Year Percent of GDP (Units) 1994 14.663 1995 18.912 1996 19.839 1997 18.524 1998 18.721 1999 19.505 2000 18.240 2001 16.785 2002 23.139 2003 21.662 2004 24.216 2005 22.498 2006 25.299 2007 26.068 2008 31.439 2009 34.506 2010 31.958 2011 33.735 2012 36.636 2013 37.779 2014 36.374 2015 38.699 2016 35.425 2017 35.571 2018 33.183 2019 32.520 2020 40.157 2021 32.168 2022 26.202 2023 31.512 2024 31.461 2025 31.256 2026 30.789 2027 30.193 2028 29.756 2029 29.255