Year Percent of GDP (Units) 2002 6.845 2003 9.826 2004 12.676 2005 14.733 2006 18.946 2007 18.986 2008 17.036 2009 19.391 2010 21.722 2011 21.265 2012 25.210 2013 24.346 2014 23.684 2015 24.569 2016 28.156 2017 27.059 2018 30.570 2019 26.941 2020 25.694 2021 17.449 2022 15.118