Year	2011 PPP (% of population)
1986	5.2
1989	13.4
1992	5.3
1996	4.9
1997	5.2
2000	5.5
2001	3.9
2002	5.6
2003	6.6
2004	8.5
2005	5.6
2006	4.3
2007	4.3
2008	3.7
2009	3.1
2010	2.5
2011	2.9
2012	2.6
2013	2.2
2014	2.1
2015	1.8
2016	1.6