Year	2017 PPP (% of population)
1984	3.6
1987	2.9
1989	2.2
1992	2
1995	2.5
1997	0.7
2003	1.6
2006	0.8
2008	0.7
2011	0.1
2013	0
2015	0
2018	0
2021	0