Year 2017 PPP (%) 1990 72.8 1993 68.6 1996 61.1 1999 58.5 2002 51 2005 40.8 2008 34.3 2010 29.3 2011 25.9 2012 22.9 2013 17.1 2014 14.5 2015 12.2 2016 10.5 2017 9.7 2018 8 2019 6.4 2020 5.9