Year	2017 PPP (% of population)
2004	19.3
2005	17.3
2006	9.4
2007	6.1
2008	7.9
2009	11.7
2010	11.9
2011	11.2
2012	10.4
2013	8.1
2014	7.1
2015	4.9
2016	4.6
2017	4.5
2018	3
2019	2.6
2020	2.5
2021	2.1