Year	2017 PPP (% of population)
1987	90.1
1990	89.6
1996	70
1998	71.6
2001	77.4
2004	64.8
2005	65.1
2007	60.6
2010	52.4
2011	51.7
2013	44.6
2015	40
2018	39.8