Year	2017 PPP (% of population)
1981	42.9
1982	43
1983	50.9
1984	50.1
1985	45.2
1986	26.1
1987	36.5
1988	39.3
1989	36.4
1990	41.6
1992	40.7
1993	39.7
1995	29.7
1996	30
1997	30.2
1998	28.9
1999	29.9
2001	26.2
2002	25.3
2003	26.1
2004	24.4
2005	22.3
2006	19.4
2007	18
2008	15.7
2009	14.6
2011	12
2012	10.6
2013	9.5
2014	8.6
2015	9.3
2016	10.6
2017	11
2018	10.9
2019	10.8
2020	5.3
2021	11.3
2022	8.4