Year Percent of GDP 1990 23.18 1991 20.414 1992 18.692 1993 20.14 1994 20.419 1995 22.628 1996 28.075 1997 28.365 1998 28.605 1999 28.674 2000 26.377 2001 28.57 2002 30.859 2003 31.901 2004 31.481 2005 29.327 2006 30.927 2007 31.349 2008 34.8 2009 38.667 2010 33.175 2011 31.978 2012 29.808 2013 27.028 2014 26.749 2015 27.287 2016 28.139 2017 28.598 2018 30.159 2019 28.242 2020 27.785 2021 27.179 2022 26.774 2023 26.302 2024 26.578