Year % of GDP 2009 23.97578450216169 2010 26.841249818862547 2011 20.07878408563329 2012 17.971216977729707 2013 40.12760266194 2014 22.654612394466657 2015 20.24773571343498 2016 19.526080458637082 2017 22.447688523931834 2018 29.717547553821074 2021 158.16500929543344