Year Percent of GDP (Units) 2000 16.315 2001 15.163 2002 13.770 2003 12.154 2004 11.759 2005 12.789 2006 13.236 2007 13.985 2008 14.196 2009 17.008 2010 20.933 2011 18.760 2012 22.376 2013 20.209 2014 21.855 2015 20.212 2016 16.024 2017 16.294 2018 16.244 2019 15.418 2020 12.990 2021 15.036 2022 14.787 2023 15.675 2024 15.675 2025 15.760 2026 15.862 2027 16.046 2028 16.126 2029 16.126