Year	2017 PPP (% of population)
1987	8.2
1994	1.2
1995	1.5
1996	1.5
2000	0.5
2002	1.2
2003	0.5
2004	0.4
2005	0.3
2006	0.6
2007	0.5
2008	0.8
2009	1.4
2010	1.7
2011	1.4
2012	1.3
2013	1.5
2014	1.2
2015	0.8
2016	0.8
2017	0.5
2018	0.1
2019	0.2
2020	0.2
2021	0.3