Year	2017 PPP (% of population)
1979	1.2
1986	0.5
1991	0.7
1995	0.7
2000	0.5
2003	0.4
2004	0.6
2005	0.5
2006	0.7
2007	0.5
2008	0.5
2009	0.3
2010	0.4
2011	0.3
2012	0.3
2013	0.4
2014	0.4
2015	0.4
2016	0.7
2017	0.6
2018	0.5
2019	0.5