Year	2017 PPP (% of population)
1989	78.6
1990	78.7
1991	78.5
1992	77.8
1993	78.2
1994	77.4
1995	77
1996	76.2
1997	75.7
1998	75.6
1999	76
2000	75.9
2001	75.7
2002	75.3
2003	74.1
2004	71.6
2005	69.9
2006	68.4
2007	66.6
2008	64.8
2009	63.6
2010	62.3
2011	61
2012	60
2013	58.7
2014	57.6
2015	57.3
2016	56.5
2017	55.3
2018	54.2
2019	53.8