Year	2017 PPP (% of population)
1977	1
1978	1
1979	0.7
1980	0.5
1981	0.5
1982	0.2
1983	0.2
1984	0.5
1986	0.5
1987	1.2
1989	0.2
1991	0.5
1993	2
1995	1
1998	2.2
2000	1.7
2002	1.7
2003	1.1
2004	0.9
2005	1
2006	0.9
2007	1.1
2008	1
2009	1.3
2010	1.6
2011	1.5
2012	1.8
2013	2
2014	1.8
2015	2.6
2016	2.3
2017	1.8
2018	2.1
2019	1.3
2020	1.2
2021	1