Year Percent of GDP (Units) 1980 15.558 1981 15.558 1982 15.558 1983 15.558 1984 15.558 1985 15.558 1986 15.558 1987 15.558 1988 15.558 1989 14.790 1990 4.861 1991 10.874 1992 13.838 1993 26.345 1994 27.610 1995 29.380 1996 30.417 1997 30.648 1998 31.426 1999 29.890 2000 32.041 2001 33.736 2002 35.959 2003 38.378 2004 36.204 2005 36.508 2006 37.295 2007 42.654 2008 39.290 2009 40.140 2010 37.099 2011 32.371 2012 30.559 2013 30.213 2014 30.289 2015 32.109 2016 31.725 2017 32.305 2018 32.020 2019 31.980 2020 31.916 2021 32.896 2022 32.568 2023 31.962 2024 32.099 2025 32.315 2026 32.407 2027 32.527 2028 32.683 2029 32.632