Year	2011 PPP (%)
1981	18.5
1984	17.3
1987	16.1
1990	14.4
1993	13.6
1996	11.8
1999	11
2002	9.6
2005	8.2
2008	7.1
2010	5.9
2011	5
2012	4.6
2013	4.2
2015	3.5