Year	2011 PPP (%)
1981	0.4
1984	0.4
1987	0.4
1990	0.3
1993	0.3
1996	0.4
1999	0.4
2002	0.4
2005	0.4
2008	0.4
2010	0.4
2011	0.4
2012	0.4
2013	0.4
2015	0.5