Year	2017 PPP (% of population)
1981	76.5
1982	76.3
1983	76.2
1984	75.7
1985	74.9
1986	73.7
1987	73.5
1988	72.4
1989	72.8
1990	72.6
1991	72.3
1992	71.5
1993	70.8
1994	69.5
1995	68.2
1996	66.9
1997	66.3
1998	66
1999	65.3
2000	63.8
2001	62.7
2002	60.8
2003	58.9
2004	56.6
2005	54.3
2006	52.6
2007	50.5
2008	49.1
2009	47.4
2010	44.7
2011	41.9
2012	40.1
2013	37.4
2014	36.2
2015	34.9
2016	34.1
2017	32.4
2018	30
2019	28.4
2020	29.5
2021	28.7
2022	27.4