Year	2017 PPP (% of population)
1989	18.9
1991	22.1
1995	13.3
1996	15.3
1998	21
1999	17.3
2000	12.9
2001	14.1
2002	14.7
2003	15.8
2004	11.5
2005	11.3
2006	7.7
2007	5.1
2008	7.7
2009	7.4
2010	6.3
2011	5.3
2012	4.6
2013	3.6
2014	3.4
2015	2.3
2016	2.6
2017	2.2
2018	1.8
2019	1.4
2021	3.6
2022	3.4