Year	2011 PPP (%)
1981	22.4
1984	25.6
1987	22.5
1990	23.9
1993	23.4
1996	22.9
1999	22.5
2002	20.8
2005	18.2
2008	13.8
2010	12.7
2011	11.9
2012	10.8
2013	10.5
2015	9.8