Year	2017 PPP (% of population)
1981	79.7
1982	79.5
1983	79.1
1984	78.7
1985	78.2
1986	77.8
1987	77.7
1988	77.1
1989	76.9
1990	76.5
1991	76.2
1992	75.7
1993	75.7
1994	75
1995	74.5
1996	73.5
2002	71.6
2003	70.5
2004	69
2005	67.7
2006	66.2
2007	64.5
2008	63.2
2009	61.1
2010	58.4
2011	55.4
2012	53.7
2013	52.5
2014	51.6
2015	50.6
2016	49.7
2017	47
2018	43
2019	40.6
2020	42.9
2021	41.2
2022	38.8