Year	2017 PPP (% of population)
1985	0.7
1988	0.7
1992	1.2
1995	1.2
1997	1
2000	1
2003	0.9
2004	0.4
2005	0.5
2006	0.4
2007	0.4
2008	0.3
2009	0.3
2010	0.5
2011	0.6
2012	0.5
2013	0.5
2014	0.3
2015	0.2
2016	0.3
2017	0.4
2018	0.2
2019	0.2
2020	0.3
2021	0.2