Year	2017 PPP (% of population)
2004	0.5
2005	0.5
2006	0.4
2007	0.2
2008	0.1
2009	0.2
2010	0.1
2011	0.3
2012	0.3
2013	0.4
2014	0.3
2015	0.3
2016	0.2
2017	0.1
2018	0.1
2019	0.1
2020	0
2021	0.1