Year	2011 PPP (% of population)
1987	40.6
1994	39.1
2002	35
2003	38.5
2004	28.1
2005	25.7
2006	23.2
2007	19.8
2008	16.9
2009	16.7
2010	15.9
2011	13.6
2012	13
2013	11.4
2014	10.5
2015	11.5
2016	9.9