Year	2017 PPP (% of population)
1990	92.7
1993	87.1
1996	78.1
1999	73.3
2002	62.8
2005	49
2008	39.7
2010	33.1
2011	28
2012	24.2
2013	15.8
2014	12.7
2015	9.8
2016	7.8
2017	6.8
2018	5
2019	3
2020	2