Year	2011 PPP (% of population)
1998	78.1
2000	94.2
2001	94.3
2002	93.3
2003	93
2004	77.6
2005	82.9
2006	70.2
2007	71.1
2008	63.8
2009	63.1
2010	66.1
2011	66.3
2012	69.3
2013	69.5
2014	66.7
2015	70
2016	67.2
2017	66.4