Year Percent of GDP (Units) 1993 16.996 1994 14.511 1995 13.972 1996 15.021 1997 13.728 1998 14.122 1999 13.236 2000 13.820 2001 12.949 2002 14.365 2003 12.854 2004 12.125 2005 12.954 2006 14.468 2007 16.121 2008 18.035 2009 17.301 2010 18.317 2011 17.923 2012 19.428 2013 19.506 2014 18.094 2015 17.833 2016 17.712 2017 19.128 2018 19.108 2019 19.054 2020 20.296 2021 18.458 2022 19.959 2023 19.195 2024 19.879 2025 19.630 2026 18.117 2027 17.467 2028 16.994 2029 16.936