Year	2017 PPP (% of population)
1982	2.7
1983	2.6
1984	2.6
1985	2.5
1986	2.4
1987	2.4
1988	2.3
1989	2.2
1990	2.2
1991	2.3
1992	2.7
1993	3.4
1994	4
1995	3.2
1996	3.6
1997	2.2
1998	2.5
1999	3.5
2000	3.1
2001	2.5
2002	2.2
2003	2.1
2004	1.8
2005	1.6
2006	1.4
2007	1.2
2008	1
2009	0.9
2010	0.9
2011	0.9
2012	0.9
2013	0.9
2014	1.1
2015	1.1
2016	0.9
2017	1
2018	0.8
2019	0.7
2020	0.6
2021	0.5
2022	0.5