Year	2017 PPP (% of population)
1981	84.1
1982	84
1983	84.4
1984	84.2
1985	83.8
1986	82.4
1987	83
1988	83
1989	82.6
1990	82.7
1991	82.9
1992	83
1993	82.7
1994	81.8
1995	80.9
1996	80.3
1997	80
1998	79.5
1999	79.3
2000	77.2
2001	75.8
2002	73.3
2003	71.6
2004	68.8
2005	65.8
2006	63.1
2007	60.1
2008	57.9
2009	56
2010	52.7
2011	49.6
2012	46.6
2013	42.3
2014	39.5
2015	36.7
2016	34.3
2017	32.6
2018	30.2
2019	28.3
2020	28.4
2021	26
2022	25