Year Percent of GDP (Units) 1996 31.609 1997 29.495 1998 43.240 1999 42.974 2000 42.598 2001 45.459 2002 40.889 2003 34.160 2004 35.162 2005 36.917 2006 34.227 2007 36.154 2008 30.509 2009 17.751 2010 20.929 2011 23.120 2012 26.028 2013 21.700 2014 25.650 2015 26.877 2016 28.903 2017 25.125 2018 27.926 2019 27.168 2020 24.606 2021 20.679 2022 24.067 2023 23.355 2024 23.775 2025 23.506 2026 24.319 2027 25.441 2028 26.564 2029 27.654