Year % of GDP 1991 18.32604917083045 1992 17.352066747752122 1993 17.66999734156569 1994 18.3337960765434 1995 18.986174017498364 1996 19.302476351205815 1997 19.303042469941854 1998 21.285703491584382 1999 21.759709584787796 2000 19.458237583115608 2005 31.773393613560856 2006 31.74585558218755 2007 32.013266481351586 2008 32.62659982143135 2009 33.166769326897985 2010 33.432138965497735 2011 33.85358204493279 2012 33.0228555758338 2013 32.32889451454994 2014 31.386955097638612 2015 31.089083329259864 2016 31.177419518138162 2017 31.255527876727335 2018 30.724883616643062 2019 30.649719274413158 2020 32.56168997644017 2021 32.91011123682065 2022 31.690701181391756