Year	2011 PPP (% of population)
1981	96.5
1984	96.1
1987	95.6
1990	95.3
1993	95
1996	93.9
2002	92.8
2005	91
2008	89.8
2010	88.5
2011	86.4
2012	85.3
2013	84.2