Year	2017 PPP (% of population)
1981	97.6
1982	97.5
1983	97.4
1984	97.2
1985	97
1986	96.9
1987	96.8
1988	96.7
1989	96.7
1990	96.7
1991	96.6
1992	96.4
1993	96.4
1994	96.1
1995	95.9
1996	95.6
2002	94.8
2003	94.5
2004	94
2005	93.6
2006	93.2
2007	92.9
2008	92.6
2009	92.3
2010	91.5
2011	90.1
2012	89.2
2013	88.6
2014	88.1
2015	87.6
2016	87.3
2017	85.1
2018	82.6
2019	80.6
2020	82.1
2021	81.2
2022	79.2