Year 2017 PPP (%) 2003 2.3 2004 1.1 2005 0.7 2006 0.7 2007 0.4 2008 0.4 2009 0.5 2010 0.7 2011 0.9 2012 0.7 2013 0.9 2014 0.7 2015 0.5 2016 0.4 2017 0.3 2018 0.3 2019 0.5 2020 0.3 2021 0.3