Year	2017 PPP (% of population)
1991	0
1992	0.2
1993	0
1994	0.2
1995	0.2
1996	0.2
1997	0.2
1998	0
1999	0.2
2000	0
2001	0.2
2002	0
2003	0.2
2004	0
2005	0
2006	0
2007	0
2008	0.2
2009	0
2010	0.2
2011	0
2012	0
2013	0
2014	0.2
2015	0
2016	0.2
2017	0.5
2018	0.2
2019	0.2