Year Percent of GDP 1980 34.136 1981 37.059 1982 36.513 1983 34.254 1984 34.382 1985 31.281 1986 35.307 1987 35.757 1988 31.888 1989 33.868 1990 38.72 1991 40.889 1992 42.094 1993 41.754 1994 37.408 1995 36.294 1996 35.96 1997 38.56 1998 41.181 1999 39.143 2000 38.245 2001 41.866 2002 44.749 2003 42.39 2004 39.313 2005 33.368 2006 32.294 2007 35.952 2008 47.241 2009 51.41 2010 42.034 2011 36.409 2012 35.83 2013 32.017 2014 34.652 2015 35.752 2016 32.539 2017 31.818 2018 31.89 2019 31.366 2020 30.478 2021 29.439 2022 28.344 2023 27.635 2024 27.494