Year	2011 PPP (% of population)
1998	75.8
1999	71.4
2000	65.2
2001	49
2002	42
2003	38.3
2004	26.8
2005	16.6
2006	11.3
2007	7.2
2008	5.3
2009	5
2010	3.4
2011	2.5
2012	1.1
2013	0.7
2014	0.4
2015	0.9
2016	0.7
2017	0.8