Year	2011 PPP (%)
1981	11.5
1984	13.7
1987	11.5
1990	12.6
1993	12
1996	11.9
1999	11.7
2002	10.2
2005	8.7
2008	6.2
2010	5.6
2011	5.2
2012	4.4
2013	4.2
2015	3.6