Year	2017 PPP (% of population)
1980	0.5
1985	0.2
1990	0.5
1993	1.2
1994	1
1995	1.5
1996	1.5
1997	1
1998	1
1999	0.7
2000	0.7
2003	0.8
2004	0.8
2005	0.7
2006	0.8
2007	0.4
2008	0.5
2009	0.8
2010	0.7
2011	1.1
2012	0.9
2013	1.1
2014	0.8
2015	0.9
2016	1.1
2017	0.7
2018	0.8
2019	0.8
2020	0.9
2021	0.6