Year Percent of GDP (Units) 1985 46.147 1986 46.887 1987 46.073 1988 46.113 1989 47.944 1990 49.506 1991 53.013 1992 52.529 1993 46.809 1994 42.778 1995 41.625 1996 39.886 1997 39.348 1998 40.144 1999 39.267 2000 38.311 2001 37.247 2002 36.776 2003 36.686 2004 36.162 2005 37.116 2006 37.854 2007 37.080 2008 38.573 2009 40.450 2010 43.039 2011 42.420 2012 39.784 2013 38.636 2014 37.684 2015 37.223 2016 36.450 2017 35.620 2018 36.104 2019 38.835 2020 42.069 2021 41.843 2022 41.961 2023 41.140 2024 41.267 2025 40.789 2026 40.370 2027 39.947 2028 39.478 2029 38.362