Year Percent of GDP (Units) 1984 153.264 1985 125.667 1986 102.688 1987 76.941 1988 64.586 1989 59.760 1990 58.017 1991 67.439 1992 70.998 1993 63.267 1994 52.539 1995 42.752 1996 35.583 1997 32.095 1998 31.211 1999 29.061 2000 30.291 2001 27.098 2002 23.176 2003 18.443 2004 12.882 2005 7.502 2006 2.843 2007 -0.749 2008 -2.182 2009 -1.021 2010 2.495 2011 6.591 2012 8.522 2013 8.613 2014 7.936 2015 7.340 2016 6.630 2017 5.552 2018 4.720 2019 6.869 2020 10.355 2021 13.968 2022 18.020 2023 20.534 2024 23.260 2025 24.778 2026 25.354 2027 25.362 2028 24.693 2029 23.652