Year	2011 PPP (% of population)
1989	79.6
1990	81.7
1991	78.3
1992	75.4
1993	68.4
1994	68.4
1995	69.7
1996	71.7
1997	63.8
1998	63.6
1999	65.2
2001	55
2002	60.3
2003	63.9
2004	63.2
2005	60.8
2006	55.2
2007	52.9
2008	49.9
2009	46.8
2010	49.9
2011	52.3
2012	57.1
2013	55.3
2014	53.9
2015	53.8
2016	50.4
2017	52.6