Year % of GDP 1995 27.14424269961379 1996 28.102898145833638 1997 28.29958261989714 1998 29.04987853757579 1999 27.629756314665627 2000 29.609913822382634 2001 31.172773454949663 2002 33.22053449106133 2003 35.444857957463036 2004 35.465331668779974 2005 33.757402891244105 2006 34.53665107647671 2007 39.566270897014604 2008 36.49312179658141 2009 37.162555433521504 2010 37.09907600295239 2011 32.371143539838066 2012 30.559289702689057 2013 30.21290351452177 2014 30.289026826742987 2015 32.108915889165715 2016 31.72453900689098 2017 32.30530084858055 2018 32.01950292742783 2019 31.979960650536043 2020 31.915688359215466 2021 32.89560231548707 2022 32.56809515011004