Year Percent of GDP 1990 39.133 1991 41.25 1992 36.744 1993 32.893 1994 30.706 1995 30.875 1996 28.535 1997 28.152 1998 29.21 1999 31.334 2000 30.894 2001 29.726 2002 29.418 2003 28.513 2004 29.767 2005 31.216 2006 32.1 2007 31.519 2008 30.667 2009 29.455 2010 31.924 2011 32.466 2012 32.531 2013 31.479 2014 32.055 2015 32.808 2016 28.855 2017 27.993 2018 29.332 2019 30.036 2020 30.198 2021 30.354 2022 30.484 2023 30.425 2024 30.018