Year	2017 PPP (% of population)
1990	72
1993	62.7
1996	48.1
1999	46
2002	36.5
2005	22.1
2008	18
2010	13.9
2011	10.2
2012	8.5
2013	2.9
2014	2.1
2015	1.2
2016	0.8
2017	0.7
2018	0.4
2019	0.1
2020	0.1