Year	2017 PPP (% of population)
1987	34.8
1990	28.1
1992	21.6
1994	20.2
1996	16.2
1998	14.9
2000	16
2003	15.3
2006	7.6
2009	5.5
2011	3.9
2013	2
2015	1.5
2017	1
2020	2.7
2022	0.9