Year Percent of GDP (Units) 1982 15.054 1983 15.067 1984 15.312 1985 14.696 1986 14.171 1987 14.720 1988 14.551 1989 17.711 1990 17.448 1991 17.691 1992 18.408 1993 20.003 1994 20.572 1995 22.196 1996 25.069 1997 26.176 1998 26.341 1999 28.259 2000 26.579 2001 27.507 2002 28.074 2003 28.014 2004 26.631 2005 25.889 2006 28.441 2007 28.162 2008 28.429 2009 30.914 2010 30.350 2011 30.233 2012 29.093 2013 29.998 2014 31.261 2015 31.277 2016 29.994 2017 29.320 2018 34.658 2019 32.879 2020 33.542 2021 34.302 2022 33.934 2023 35.038 2024 33.891 2025 32.864 2026 32.282 2027 32.254 2028 32.006 2029 31.680