Year Percent of GDP 1980 13.336 1981 18.665 1982 18.293 1983 17.269 1984 17.008 1985 17.381 1986 17.091 1987 16.83 1988 17.103 1989 17.404 1990 17.508 1991 17.68 1992 18.275 1993 18.909 1994 19.547 1995 20.443 1996 21.295 1997 22.218 1998 23.04 1999 23.718 2000 24.151 2001 24.314 2002 24.585 2003 25.093 2004 25.709 2005 26.063 2006 26.162 2007 26.191 2008 26.204 2009 26.228 2010 26.874 2011 27.871 2012 28.33 2013 28.489 2014 28.742 2015 29.295 2016 30.11 2017 30.896 2018 31.599 2019 31.326 2020 31.171 2021 31.871 2022 32.12 2023 31.868 2024 31.657