Year	2017 PPP (% of population)
1975	1
1981	1.2
1987	0.7
1992	1
1995	1.5
2000	0.5
2001	0.5
2002	0.5
2003	1
2004	1
2005	1.8
2006	1
2007	0.9
2008	1
2009	1.1
2010	1.3
2011	1.4
2012	1.2
2013	1.3
2014	1.1
2015	1.1
2016	0.9
2017	0.8
2018	1.4
2019	0.9
2020	0.9
2021	1.4