Year Percent of GDP (Units) 2002 6.943 2003 11.927 2004 15.069 2005 15.651 2006 18.262 2007 21.448 2008 20.899 2009 21.151 2010 20.789 2011 21.937 2012 25.028 2013 24.977 2014 25.402 2015 25.947 2016 28.029 2017 27.732 2018 28.936 2019 27.999 2020 27.937 2021 17.934 2022 16.116