Year	2017 PPP (% of population)
1970	0
1975	0.2
1979	0.2
1984	0.5
1990	0.2
1996	0.2
1997	0.2
1998	0
1999	0
2000	0
2001	0
2002	0
2003	0.2
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0.1
2011	0
2012	0.1
2013	0.1
2014	0
2015	0.1
2016	0.1
2017	0
2018	0
2019	0.1
2020	0.1
2021	0.1