Year 2011 PPP (%) 1992 9 1996 15.2 1999 17.9 2000 16 2001 17.4 2002 12.2 2003 10.5 2004 9.7 2005 8.6 2008 9.1 2009 8 2010 6.9 2011 5.9 2012 5.7 2013 5.3 2014 4.8 2015 4.3 2016 4.3 2017 3.8