Year	2017 PPP (% of population)
1979	0.8
1986	0.9
1992	0.5
1997	1
2001	0.5
2002	1.7
2003	2
2004	2
2005	1.5
2006	1.2
2007	1
2008	1.5
2009	1.7
2010	1.2
2011	1.5
2012	1.2
2013	1
2014	1.2
2015	0.7
2016	1
2017	1.2
2018	1
2019	1.2
2020	1
2021	1