Year	2011 PPP (% of population)
1986	13.5
1989	30.8
1992	17.7
1996	13.4
1997	12.6
2000	12.9
2001	12.3
2002	14
2003	17.1
2004	22.4
2005	16.4
2006	13.7
2007	13.3
2008	13.7
2009	12.2
2010	12
2011	10.4
2012	11.1
2013	10
2014	7.8
2015	6.4
2016	5.9