Year Percent of GDP 2004 17.302 2005 17.625 2006 17.922 2007 20.653 2008 22.032 2009 24.837 2010 24.363 2011 25.376 2012 30.576 2013 30.16 2014 23.732 2015 26.293 2016 23.436 2017 25.699 2018 25.669 2019 23.299 2020 23.909 2021 23.826 2022 23.752 2023 23.686 2024 23.618