Year Percent of GDP 1980 12.27 1981 8.971 1982 10.955 1983 11.829 1984 12.266 1985 8.013 1986 9.931 1987 10.999 1988 10.99 1989 6.967 1990 10.359 1991 13.254 1992 17.562 1993 13.672 1994 13.999 1995 14.411 1996 19.922 1997 22.618 1998 24.007 1999 31.73 2000 32.336 2001 34.001 2002 31.435 2003 30.564 2004 30.237 2005 32.786 2006 34.29 2007 30.547 2008 25.516 2009 30.661 2010 31.902 2011 29.924 2012 33.203 2013 31.219 2014 31.717 2015 27.519 2016 29.52 2017 29.578 2018 29.596 2019 29.099 2020 28.605 2021 28.339 2022 27.952 2023 27.305 2024 26.739