Year	2017 PPP (% of population)
1992	0.7
1993	0.5
1996	1.5
2002	0.7
2004	1.3
2005	0.8
2006	0.8
2007	0.7
2008	0.5
2009	0.8
2010	0.9
2011	0.8
2012	0.9
2013	0.7
2014	0.8
2015	0.4
2016	0.7
2017	0.5
2018	0.2
2019	0.3
2020	0.4
2021	0.3