Year	2017 PPP (% of population)
1986	37.6
1989	65.3
1992	52.5
1996	42.3
1997	39.4
2000	41.1
2001	40.5
2002	40
2003	49
2004	57
2005	48.2
2006	45
2007	44.3
2008	45.9
2009	42.9
2010	43.7
2011	41.6
2012	41.2
2013	40.5
2014	34.8
2015	30.4
2016	28.7
2017	25.5
2018	22.2
2019	20.2
2020	23.2
2021	23.2
2022	21.5