Year Percent of GDP 1980 19.905 1981 19.234 1982 19.154 1983 19.478 1984 20.512 1985 20.906 1986 21.825 1987 21.569 1988 22.438 1989 21.952 1990 21.606 1991 20.769 1992 18.926 1993 19.337 1994 19.098 1995 21.056 1996 20.946 1997 21.431 1998 21.726 1999 21.648 2000 22.179 2001 22.182 2002 23.162 2003 23.94 2004 23.167 2005 22.522 2006 22.306 2007 21.687 2008 20.345 2009 20.285 2010 19.627 2011 18.728 2012 19.763 2013 20.232 2014 20.533 2015 21.603 2016 22.694 2017 22.948 2018 22.679 2019 22.869 2020 22.95 2021 23.071 2022 23.088 2023 23.078 2024 23.06