Year Percent of GDP (Units) 1983 4.419 1984 6.832 1985 10.034 1986 9.981 1987 13.997 1988 14.943 1989 16.198 1990 29.981 1991 26.289 1992 24.980 1993 25.180 1994 25.274 1995 23.688 1996 22.092 1997 25.383 1998 24.619 1999 7.480 2000 34.651 2001 35.184 2002 28.889 2003 32.491 2004 41.418 2005 42.733 2006 38.737 2007 37.048 2008 40.109 2009 38.026 2010 47.916 2011 23.233 2012 31.078 2013 24.772 2014 27.165 2015 27.710 2016 25.456 2017 19.566 2018 21.709 2019 18.647 2020 18.224 2021 17.037 2022 16.240 2023 18.334 2024 19.324 2025 20.257 2026 21.777 2027 22.834 2028 23.984 2029 25.367