Year Percent of GDP (Units) 1983 29.002 1984 28.531 1985 28.089 1986 27.989 1987 27.819 1988 28.300 1989 27.717 1990 27.629 1991 29.466 1992 31.287 1993 32.455 1994 32.496 1995 32.447 1996 32.971 1997 32.935 1998 32.683 1999 33.248 2000 32.232 2001 31.597 2002 34.090 2003 33.229 2004 33.061 2005 32.395 2006 30.529 2007 29.454 2008 29.967 2009 31.759 2010 31.448 2011 31.448 2012 31.657 2013 32.546 2014 32.173 2015 32.474 2016 32.445 2017 32.444 2018 31.744 2019 31.968 2020 37.010 2021 34.520 2022 31.935 2023 32.002 2024 32.031 2025 32.144 2026 32.154 2027 32.154 2028 32.154 2029 32.154