Year Percent of GDP 1980 22.675 1981 22.677 1982 22.451 1983 23.306 1984 24.656 1985 23.577 1986 24.36 1987 23.979 1988 26.245 1989 28.08 1990 26.305 1991 25.186 1992 24.745 1993 24.754 1994 25.78 1995 27.421 1996 27.333 1997 28.852 1998 25.915 1999 26.722 2000 24.31 2001 24.992 2002 23.338 2003 25.639 2004 27.052 2005 26.516 2006 28.813 2007 29.248 2008 26.42 2009 26.468 2010 27.511 2011 29.026 2012 29.392 2013 28.257 2014 26.421 2015 28.81 2016 28.514 2017 31.16 2018 30.99 2019 30.863 2020 30.916 2021 30.77 2022 31.113 2023 31.07 2024 31.121