Year % of GDP 1995 1.44273154708812 1996 1.39565861276589 1997 1.01885217696713 1998 0.702714839275153 1999 0.835114128882281 2000 1.00761756848222 2001 0.950531620904502 2002 0.809312518866469 2003 0.731872390939613 2004 0.655048870768867 2005 0.590099054196955 2006 0.550049584611631 2007 0.480122912458821 2008 0.439415086610715 2009 0.401930501280375 2010 0.524773473420892 2011 0.55272441723569 2012 0.50334215016971 2013 0.451433196719953 2014 0.435666728185002 2015 0.355871871770943 2016 0.3377588483904 2017 0.408008846501474 2018 0.378395633092732 2019 0.334182488318804 2020 0.310782585398606 2021 0.28612663033099