Year Percent of GDP 1980 31.356 1981 34.115 1982 26.529 1983 27.173 1984 25.543 1985 22.05 1986 21.021 1987 17.784 1988 21.228 1989 22.746 1990 19.413 1991 19.025 1992 16.769 1993 15.162 1994 17.72 1995 19.167 1996 18.04 1997 17.715 1998 17.991 1999 17.035 2000 16.365 2001 15.745 2002 16.278 2003 17.106 2004 18.467 2005 18.315 2006 20.183 2007 20.986 2008 23.15 2009 20.705 2010 19.513 2011 19.721 2012 19.966 2013 21.164 2014 20.499 2015 20.918 2016 19.161 2017 18.806 2018 17.94 2019 17.838 2020 17.801 2021 17.874 2022 17.986 2023 18.109 2024 18.236