Year % of GDP 2001 22.7667131917867 2002 21.5615722204279 2003 26.6544081298562 2004 26.6308452510316 2005 25.7664440515198 2006 28.8284931279669 2007 28.6410259515017 2008 27.7613592965688 2009 25.7563600648175 2010 24.2180601037473 2011 23.9639376614018 2012 32.1720830379679 2013 33.1309422206307 2014 33.4961520638742 2015 35.2622063576515 2016 35.7028493109233 2017 35.1676363647662 2018 35.0489023345193 2019 34.0772330115113 2020 35.8527044639032 2021 35.8282650649645 2022 36.8406401538103 2023 37.9755037094531