Year	2017 PPP (% of population)
1979	6.2
1989	22.4
1991	20.1
1995	15.2
1997	14.2
1998	14.5
1999	12.3
2000	11.1
2001	14
2002	9.6
2003	9.9
2004	8.7
2005	8.6
2006	9.4
2007	6.7
2008	4.1
2009	2.5
2010	3.4
2011	2.5
2012	3.5
2013	2.2
2014	2.9
2015	1.5
2016	1.5
2017	2.1
2018	1.4
2019	1
2021	1.1
2023	1.3