Year $ 2017 PPP (%) 1993 0.12 1998 0.02 1999 0.03 2000 0.02 2001 0.03 2002 0.04 2003 0.03 2004 0.05 2005 0.07 2006 0.01 2007 0 2008 0 2009 0 2010 0 2011 0 2012 0 2013 0 2014 0.01 2015 0 2016 0 2017 0 2018 0 2019 0 2020 0 2021 0