Year	2011 PPP (% of population)
1981	83.1
1984	85.1
1987	85.6
1990	86.1
1993	88.4
1996	87.2
1999	84.2
2002	84.8
2005	84.4
2008	82.2
2010	80.1
2011	80.1
2012	79.3
2013	78.9
2015	78.8