Year Percent of GDP (Units) 2001 51.486 2002 59.934 2003 54.259 2004 50.186 2005 47.915 2006 46.486 2007 44.546 2008 37.566 2009 40.885 2010 37.979 2011 34.470 2012 32.194 2013 30.504 2014 32.586 2015 35.640 2016 46.144 2017 51.370 2018 52.766 2019 54.699 2020 61.370 2021 55.114 2022 56.133 2023 60.913 2024 61.449 2025 64.198 2026 66.146 2027 67.867 2028 69.236 2029 69.456