Year	2017 PPP (% of population)
1980	1
1986	1.8
1987	2.1
1991	3
1992	4.1
1993	4.9
1994	4.4
1995	7.4
1996	8.3
1997	7.8
1998	8.3
1999	8.9
2000	10.7
2001	15.4
2002	24
2003	12.7
2004	9.8
2005	8
2006	6
2007	5
2008	4.8
2009	4.1
2010	3.1
2011	2.1
2012	2.3
2013	2.1
2014	2.1
2016	2.3
2017	2.4
2018	2.9
2019	3.4
2020	4
2021	2.8
2022	2.5