Year	2017 PPP (% of population)
1987	15.4
1990	10.7
1992	6.7
1994	6.8
1996	4.7
1998	4.6
2000	5.8
2003	5.3
2006	2
2009	1.7
2011	0.9
2013	0.5
2015	0.4
2017	0.4
2020	1.3
2022	0.4