Year % of GDP 2003 19.35609528075882 2004 16.31696081035288 2005 24.158260540335885 2006 23.13912208161049 2007 30.498150612788127 2008 40.29841374492767 2009 32.212375025805876 2010 52.353317232561444 2011 64.00871489928602 2012 37.67208017728972 2013 30.095162306442518 2014 22.597956240988026 2015 24.02966610760209 2016 24.49667191624094 2017 23.61529351156998 2018 21.741180860381114 2019 31.269509364494958 2020 31.779936237833873 2021 33.3362826203432