Year	2017 PPP (% of population)
1975	0.5
1981	0.2
1987	0.2
1992	0.2
1995	0.2
2000	0
2001	0.2
2002	0
2003	0.3
2004	0.4
2005	1.1
2006	0.4
2007	0.4
2008	0.6
2009	0.5
2010	0.5
2011	0.6
2012	0.5
2013	0.7
2014	0.5
2015	0.6
2016	0.3
2017	0.2
2018	0.7
2019	0.3
2020	0.4
2021	0.6