Year	2017 PPP (% of population)
1997	19.8
1998	19.4
1999	19.3
2000	19.3
2001	20.3
2002	17.5
2003	14.7
2004	16.3
2005	17.8
2006	15.6
2007	13.2
2008	10.9
2009	8.8
2010	6.8
2011	6.5
2012	6.1
2013	5.4
2014	4.8
2015	4.7
2016	4.6
2017	4.5
2018	3.6
2019	3
2020	5.8
2021	2.8
2022	2.7