Year % of GDP 1996 0.872959971427917 1997 0.806789994239807 2003 0.324050009250641 2004 0.349029988050461 2005 0.398649990558624 2006 0.406219989061356 2007 0.545570015907288 2008 0.534630000591278 2009 0.525569975376129 2010 0.366499990224838 2011 0.337639987468719 2012 0.349070012569427 2013 0.297829985618591 2014 0.314630001783371 2015 0.307350009679794 2016 0.280039995908737 2017 0.257889986038208 2018 0.256260007619858 2019 0.241449996829033 2020 0.235109999775887 2021 0.231539994478226 2022 0.231220006942749