Year	2017 PPP (% of population)
1980	5.5
1986	4.8
1987	7.6
1991	14.3
1992	14.9
1993	15.1
1994	15.7
1995	20.5
1996	22.4
1997	21.3
1998	23.3
1999	24.2
2000	26.3
2001	31.1
2002	44.4
2003	29.7
2004	24.9
2005	21
2006	16.9
2007	15.6
2008	14.2
2009	12.9
2010	11.4
2011	9.1
2012	8.6
2013	8.6
2014	9.5
2016	9.2
2017	8.2
2018	10.4
2019	12
2020	15.4
2021	11.4
2022	10.9