Year	2017 PPP (% of population)
2004	5
2005	2.8
2006	1.8
2007	1.3
2008	0.7
2009	0.9
2010	1.1
2011	0.9
2012	0.7
2013	0.9
2014	1.1
2015	0.9
2016	0.6
2017	0.6
2018	0.4
2019	0.2
2020	0.3
2021	0.2