Year $ 2017 PPP (%) 1998 2.28 1999 3.41 2000 3.64 2001 3.46 2002 2.26 2003 1.08 2004 0.57 2005 1.63 2006 0.75 2007 0.3 2008 0.13 2009 0.21 2010 0.13 2011 0.02 2012 0.04 2013 0 2014 0 2015 0 2016 0 2017 0 2018 0 2019 0.03 2020 0 2021 0.09