Year % of GDP 1997 9.829579775912984 1998 10.166047491765255 1999 11.030915843324816 2000 14.977009985747802 2001 14.446790591182854 2002 17.35873500633482 2003 18.902913206288 2004 21.1555238953202 2005 24.854471378667238 2006 29.188729972463527 2007 35.850719765499875 2008 34.11272354602444 2009 39.49921292812852 2010 41.862561628592395 2011 41.53746570089816 2012 43.09131102705814 2013 41.659759698157835 2014 44.42179181422834 2015 45.643081015329614 2016 48.51940130894188 2017 47.79615931013645 2018 51.367785084925835 2019 52.077149607551945 2020 60.58299973842889 2021 60.23687374637029 2022 56.88061344483874 2023 55.80312905972684