Year % of GDP 2009 27.6587104876344 2010 27.2530411349395 2011 30.0821993577662 2012 33.4341714348422 2013 36.0581396070456 2014 36.4235451552096 2015 39.1187982955119 2016 39.4024246939413 2017 38.7323495613041 2018 38.8054496665639 2019 38.3726939516609 2020 38.6795390891453 2021 36.9908270556254 2022 35.2890995275057 2023 36.0128402502417