Year	2017 PPP (% of population)
1990	4.7
1995	23.5
1997	20.4
1999	20.4
2001	18.4
2002	27.2
2003	20
2004	17.3
2005	15
2006	19.5
2007	16.7
2008	14.2
2009	14.6
2010	13.5
2011	12.9
2012	10.2
2013	6.8
2014	7.6
2015	7.1
2016	7.2
2017	5.2
2018	5.8
2019	5.1
2020	5.2
2021	4.1
2022	5.6