Year	2011 PPP (% of population)
1984	8.9
1987	8.1
1990	6.2
1993	7
1996	6.2
1999	3.8
2002	3.4
2005	3.1
2008	2.7
2010	2
2011	2.4
2012	2.4
2013	2.4
2015	4.2