Year	2017 PPP (% of population)
1990	75.1
1991	75.8
1992	76.5
1993	77.7
1994	77.9
1995	77.6
1996	77.3
1997	77.2
1998	77.4
1999	77.6
2000	77.6
2001	77.2
2002	76.9
2003	76.6
2004	74.9
2005	73.7
2006	72.4
2007	71.6
2008	70.6
2009	70.2
2010	69
2011	68.2
2012	67.4
2013	66.6
2014	65.8
2015	65.7
2016	65.4
2017	64.8
2018	64.2
2019	63.9