Year	2017 PPP (% of population)
1980	0.3
1986	1.1
1987	1.2
1991	1
1992	1.7
1993	2
1994	1.9
1995	3.9
1996	4.2
1997	3.8
1998	4
1999	4.2
2000	5
2001	8.2
2002	12.4
2003	5.4
2004	3.9
2005	2.7
2006	2.2
2007	1.8
2008	1.6
2009	1.6
2010	0.7
2011	0.7
2012	0.6
2013	0.7
2014	0.6
2016	0.7
2017	0.6
2018	1
2019	1.1
2020	1.2
2021	0.9
2022	0.6