Year	2011 PPP (% of population)
1987	0.3
1989	12.2
1993	2.1
2004	3
2005	4.7
2006	2
2007	1.7
2008	1.5
2009	1.5
2010	2.5
2011	2.7
2012	4.5
2013	4.5
2014	3.2
2015	2.7