Year	2011 PPP (% of population)
1981	89.1
1984	90.4
1987	90.6
1990	91.1
1993	92.2
1996	91.2
1999	91.1
2002	91.2
2005	89.4
2008	87.5
2010	86.5
2011	85.9
2012	85
2013	84.5
2015	83.3