Year	2017 PPP (% of population)
1982	8.2
1983	8
1984	7.8
1985	7.5
1986	7.3
1987	6.9
1988	6.6
1989	6.3
1990	6.4
1991	6.7
1992	7.6
1993	9.5
1994	10.5
1995	8.7
1996	9.9
1997	8.4
1998	8.4
1999	10.4
2000	9.7
2001	8.5
2002	7.8
2003	7.4
2004	6.6
2005	6
2006	5.4
2007	4.3
2008	3.6
2009	3.4
2010	3.2
2011	3.1
2012	3
2013	2.9
2014	2.8
2015	2.9
2016	2.6
2017	2.4
2018	2.2
2019	2
2020	1.9
2021	1.5
2022	1.5