Year	2011 PPP (%)
1981	22.5
1984	18.2
1987	15.5
1990	15.6
1993	14.6
1996	11.9
1999	11.5
2002	9.9
2005	7.5
2008	6.4
2010	5.5
2011	4.8
2012	4.4
2013	3.9
2015	3.6