Year	2011 PPP (% of population)
1981	68.6
1984	71
1987	70.7
1990	70.2
1993	74.5
1996	72.8
1999	68.4
2002	67.8
2005	65.5
2008	61.5
2010	58.6
2011	58.6
2012	57
2013	56.1
2015	56.4