Year Percent of GDP 1990 19.603 1991 19.071 1992 18.686 1993 17.988 1994 17.259 1995 18.248 1996 16.75 1997 16.224 1998 15.079 1999 15.429 2000 14.424 2001 14.395 2002 14.365 2003 13.637 2004 13.379 2005 14.691 2006 15.102 2007 14.541 2008 13.599 2009 13.112 2010 13.006 2011 13.617 2012 12.225 2013 12.023 2014 11.626 2015 13.341 2016 14.224 2017 13.813 2018 13.466 2019 15.187 2020 16.131 2021 16.121 2022 16.116 2023 16.1 2024 16.098