Year	2011 PPP (% of population)
1980	0.4
1986	0
1987	0
1991	1.1
1992	2.1
1993	2.4
1994	2.3
1995	4.1
1996	4.6
1997	4.1
1998	4.6
1999	4.8
2000	5.7
2001	9.4
2002	14
2003	6.8
2004	5.2
2005	3.7
2006	3.2
2007	2.6
2008	2.6
2009	2.5
2010	2.2
2011	0.9
2012	0.8
2013	0.7
2014	0.7
2016	0.7
2017	0.5