Year	2011 PPP (% of population)
1981	74.7
1984	76.7
1987	76.9
1990	77.5
1993	78.6
1996	76
1999	76.2
2002	75.8
2005	70.8
2008	67
2010	64.6
2011	63.5
2012	61.8
2013	60.8
2015	59.3