Year 2017 PPP (%) 2004 0.2 2005 0.2 2006 0.1 2007 0.1 2008 0 2009 0.1 2010 0 2011 0 2012 0.1 2013 0.1 2014 0.1 2015 0 2016 0 2017 0 2018 0 2019 0 2020 0 2021 0