Year Percent of GDP (Units) 2000 37.680 2001 37.060 2002 38.128 2003 38.672 2004 34.958 2005 31.966 2006 24.091 2007 16.743 2008 13.043 2009 12.170 2010 10.235 2011 6.029 2012 2.730 2013 1.499 2014 2.677 2015 5.282 2016 6.906 2017 8.662 2018 10.141 2019 11.142 2020 20.995 2021 19.781 2022 19.882 2023 21.412 2024 22.924 2025 23.684 2026 23.740 2027 23.065 2028 22.401 2029 21.672