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