Year Percent of GDP (Units) 2009 37.093 2010 32.582 2011 27.085 2012 24.591 2013 28.652 2014 29.885 2015 26.755 2016 28.318 2017 27.290 2018 25.720 2019 23.855 2020 25.661 2021 25.623 2022 28.133 2023 27.130