Year Percent of GDP 1980 15.306 1981 18.875 1982 18.133 1983 16.962 1984 16.953 1985 18.999 1986 18.804 1987 16.751 1988 16.561 1989 15.376 1990 17.706 1991 19.016 1992 24.009 1993 22.292 1994 22.723 1995 19.296 1996 21.844 1997 20.055 1998 21.396 1999 25.034 2000 24.005 2001 24.826 2002 25.716 2003 25.116 2004 30.066 2005 28.141 2006 26.764 2007 29.505 2008 32.45 2009 32.88 2010 30.153 2011 24.492 2012 26.579 2013 28.19 2014 31.892 2015 33.288 2016 35.924 2017 34.641 2018 35.139 2019 34.091 2020 31.402 2021 29.47 2022 29.84 2023 30.166 2024 30.191