Year Percent of GDP (Units) 2002 37.451 2003 43.228 2004 39.897 2005 38.170 2006 42.523 2007 43.858 2008 51.098 2009 51.339 2010 46.647 2011 45.279 2012 45.707 2013 45.827 2014 44.209 2015 46.380 2016 47.516 2017 47.093 2018 47.186 2019 43.974 2020 54.350 2021 44.829 2022 42.318 2023 41.055 2024 44.212 2025 43.995 2026 44.162 2027 44.319 2028 44.678 2029 44.855