Year	2011 PPP (%)
1990	24.1
1993	20.3
1996	12.9
1999	13.1
2002	10.1
2005	4.8
2008	3.9
2010	2.7
2011	1.8
2012	1.4
2013	0.4
2014	0.3
2015	0.2