Year Percent of GDP 1981 17.12 1982 16.663 1983 15.483 1984 13.342 1985 14.511 1986 12.696 1987 11.767 1988 11.681 1989 12.976 1990 13.839 1991 12.809 1992 13.544 1993 15.309 1994 15.378 1995 16.067 1996 14.372 1997 14.135 1998 18.548 1999 17.077 2000 17.457 2001 18.243 2002 18.507 2003 19.561 2004 18.209 2005 16.2 2006 15.007 2007 13.931 2008 18.791 2009 17.286 2010 16.593 2011 18.625 2012 18.294 2013 20.035 2014 17.253 2015 18.028 2016 18.244 2017 17.324 2018 18.514 2019 19.379 2020 19.395 2021 20.089 2022 20.393 2023 19.818 2024 19.818