Year Percent of GDP (Units) 1998 27.142 1999 18.591 2000 20.336 2001 13.119 2002 10.340 2003 9.180 2004 10.478 2005 9.462 2006 12.505 2007 15.218 2008 12.269 2009 12.464 2010 9.914 2011 8.825 2012 9.647 2013 11.893 2014 11.078 2015 15.640 2016 17.031 2017 18.839 2018 20.478 2019 21.735 2020 19.728 2021 23.736 2022 23.142 2023 22.195 2024 22.349 2025 22.704 2026 22.947 2027 23.069 2028 23.130 2029 23.261