Year	2017 PPP (% of population)
1984	98.7
1987	98.8
1990	97.6
1993	97.4
1996	95.4
1998	98.5
1999	96.6
2000	96.9
2001	96
2002	91.9
2003	91
2004	91.1
2005	90.5
2006	91.4
2007	88
2008	88.1
2009	87.2
2010	82.5
2011	79.3
2012	78.5
2013	76.2
2014	74.9
2015	72.9
2016	68.3
2017	65.3
2018	62.8
2019	61.9
2020	60.7
2021	60.6
2022	60.4
2023	58.8