Year % of GDP 2002 11.270581973943528 2003 12.047448957969126 2004 13.345662280667609 2005 22.515297571231642 2006 41.27831532487812 2007 66.2231394377657 2008 51.581718759062845 2009 48.66290855096019 2010 48.12703083111206 2011 46.92435238381992 2012 51.96250140107881 2013 50.57979752106137 2014 53.713875740601146 2015 56.473829401265604 2016 56.97587420777494 2017 59.1965585650548 2018 56.291990540902795 2019 52.137199453129725 2020 59.356902535459476 2021 57.965512299611156 2022 59.61153777807563 2023 57.748561475928184