Year Percent of GDP (Units) 1991 14.768 1992 12.621 1993 14.387 1994 13.017 1995 13.458 1996 14.947 1997 12.802 1998 11.504 1999 11.622 2000 11.594 2001 11.963 2002 12.883 2003 13.589 2004 14.589 2005 15.038 2006 14.234 2007 16.386 2008 16.166 2009 15.115 2010 15.061 2011 15.518 2012 15.580 2013 15.033 2014 14.377 2015 13.982 2016 14.827 2017 15.415 2018 15.268 2019 15.225 2020 14.884 2021 14.856 2022 15.213 2023 15.622 2024 16.441 2025 16.635 2026 16.687 2027 16.669 2028 16.659 2029 16.658