Year	2017 PPP (% of population)
2004	21.6
2005	14.9
2006	8.7
2007	6.1
2008	5.3
2009	10.2
2010	10.4
2011	7
2012	7
2013	5.8
2014	6.3
2015	4.8
2016	4.9
2017	4.4
2018	2.9
2019	1.6
2020	1.6
2021	1.2