Year Percent of GDP (Units) 1998 24.224 1999 21.903 2000 20.603 2001 18.335 2002 14.720 2003 13.784 2004 13.987 2005 14.074 2006 14.995 2007 15.108 2008 13.837 2009 13.884 2010 15.164 2011 14.999 2012 19.174 2013 22.962 2014 23.777 2015 24.208 2016 23.433 2017 20.767 2018 21.031 2019 20.256 2020 22.609 2021 23.340 2022 22.601 2023 23.373 2024 23.350 2025 23.733 2026 23.736 2027 23.594 2028 23.801 2029 23.657