Year % of GDP 2010 58.6255900147511 2011 49.5000058753716 2012 46.5187793307084 2013 43.0171160061714 2014 40.8159237376703 2015 41.55766482126 2016 42.6897889223675 2017 40.9780449787265 2018 40.3733027712529 2019 38.9610442662823 2020 37.324676280867 2021 37.3348207297387 2022 35.7091290141426 2023 35.2484328970982