Year	2011 PPP (% of population)
1989	40.1
1992	46.1
1994	45.5
1996	61.6
1998	53.6
2000	44
2002	41
2004	37.6
2005	36.8
2006	33.3
2008	33.6
2010	33.7
2012	31.8
2014	33.6
2016	25.7