Year	2017 PPP (% of population)
1985	64.6
1986	65.2
1987	66.1
1988	65.9
1989	66.5
1990	63.2
1991	65
1992	63.8
1993	63.3
1994	63.1
1995	63.4
1996	61.7
1997	60.2
1998	57
1999	55.9
2000	54.1
2001	54
2003	54.8
2004	51.1
2005	50.6
2006	50.1
2007	49.5
2008	48.6
2009	46.9
2010	45.5
2011	44.1
2012	44
2013	44.3
2014	44.4
2015	43.9
2016	44.4
2017	44.8
2018	45.1