Year	2017 PPP (% of population)
1989	53.5
1992	49
1994	47.6
1996	60.4
1998	56.7
2000	49.9
2002	47
2004	44.2
2005	42.9
2006	39.7
2008	40.2
2010	40.2
2012	37.3
2014	40.3
2016	31.4
2018	28.8
2020	30.3
2022	21.8