Year	2017 PPP (% of population)
1981	25.9
1986	13.9
1989	10.6
1990	10.4
1991	12.4
1992	9.9
1993	8.5
1994	7
1995	7.1
1996	8.2
1997	6.7
1998	5.2
1999	6.8
2000	6.9
2001	5.1
2002	4.7
2003	4.7
2004	4.7
2005	3.3
2006	3.3
2007	1.8
2008	2.4
2009	2.5
2010	1.5
2011	1.8
2012	1.7
2013	1.6
2014	1.5
2015	1.6
2016	1.3
2017	1.2
2018	1.5
2019	1.1
2020	2.3
2021	1.2
2022	0.9