Year	2017 PPP (% of population)
1981	0
1989	0.7
1992	0.6
1995	0.5
1996	0.6
1997	0.6
1998	0.6
2000	0.7
2001	0.5
2002	0.6
2003	0.8
2004	1
2005	0.9
2006	0.6
2007	0.4
2008	0.2
2009	0.3
2010	0.2
2011	0.1
2012	0.2
2013	0.2
2014	0.2
2015	0.1
2016	0.1
2017	0.1
2018	0.1
2019	0.1
2020	0.2
2021	0.1
2022	0.2