Year % of GDP 2000 2.51463366 2001 2.6753974 2002 2.66876554 2003 2.92417073 2004 2.86016941 2005 2.78692698 2006 3.10897732 2007 3.07041144 2008 3.00692558 2009 3.2610569 2010 3.16474271 2011 3.31451917 2012 3.45786357 2013 3.51276922 2014 3.71036959 2015 3.82201481 2016 3.70085335 2017 3.71472311 2018 3.75944281 2019 3.83991051 2020 4.08395433 2021 4.38380671