Year	2011 PPP (%)
1981	60.4
1984	48.9
1987	44.6
1990	45.6
1993	43.5
1996	38.7
1999	37.1
2002	31.6
2005	24.5
2008	19.6
2010	16.7
2011	14.6
2012	13
2013	9.9
2015	7.6