Year	2011 PPP (% of population)
1981	79.1
1984	80.3
1987	80.8
1990	81.8
1993	84.5
1996	83.8
1999	83.8
2002	82.4
2005	78.6
2008	75.7
2010	73.8
2011	73.7
2012	72.8
2013	72.4
2015	72.9