Year	2017 PPP (% of population)
1987	62.1
1990	56
1992	50.7
1994	47.1
1996	41.4
1998	38.9
2000	41.4
2003	40.6
2006	29.1
2009	24.4
2011	20.9
2013	12.5
2015	9.7
2017	7.5
2020	9.9
2022	4.7