Year	2017 PPP (% of population)
1987	32.7
1994	35
1995	32.7
1998	35.9
1999	40.5
2000	50.2
2003	30.7
2004	32.4
2005	25.5
2006	20.1
2007	19.6
2008	18.5
2009	17.7
2010	15.1
2011	12.3
2012	11.7
2013	10.2
2014	8.7
2015	9.5
2016	9.5
2017	8.9
2018	9.7
2019	9.9
2020	14.4
2021	10.9
2022	9.5