Year	2017 PPP (% of population)
2004	16.2
2005	12.5
2006	9.2
2007	5.7
2008	4.5
2009	4.3
2010	4.1
2011	4
2012	4.3
2013	3.9
2014	3.8
2015	3.4
2016	2.4
2017	1.7
2018	1.4
2019	0.8
2020	1.1
2021	0.9