Year	2011 PPP (% of population)
1981	1.5
1984	1.5
1987	1.3
1990	1.2
1993	1.3
1996	1.8
1999	1.1
2002	1.1
2005	1
2008	0.8
2010	0.9
2011	0.9
2012	0.9
2013	0.9
2015	0.9