Year Percent of GDP (Units) 1997 13.033 1998 13.246 1999 13.475 2000 14.605 2001 15.212 2002 14.693 2003 15.490 2004 15.935 2005 14.301 2006 13.058 2007 12.417 2008 10.951 2009 10.147 2010 10.779 2011 11.132 2012 10.732 2013 10.112 2014 10.825 2015 12.297 2016 12.527 2017 12.460 2018 13.161 2019 13.454 2020 13.680 2021 14.006 2022 13.819 2023 14.079 2024 15.358 2025 16.185 2026 17.315 2027 17.811 2028 18.054 2029 18.384