Year	2017 PPP (% of population)
1971	2.2
1973	1.7
1975	1.5
1977	1.2
1979	1.2
1981	0.7
1982	0.7
1984	0.7
1985	0.5
1986	1
1987	0.5
1988	0.7
1989	1.2
1990	1.2
1991	1.2
1992	0.7
1993	1.2
1994	1
1995	0.7
1996	0.2
1997	0.2
1998	0.5
1999	0.5
2000	0.2
2001	0.2
2002	0.2
2003	0.2
2004	0.2
2005	0.2
2006	0.2
2007	0.2
2008	0.2
2009	0.2
2010	0.2
2011	0.2
2012	0.2
2013	0.5
2014	0.2
2015	0.2
2016	0.2
2017	0.2
2018	0.2
2019	0.2