Year	2017 PPP (% of population)
1992	45.1
1997	24.4
2002	29.9
2004	20.1
2006	14.9
2008	11.1
2010	2.9
2012	1.7
2014	1.9
2016	1.3
2018	1.2
2020	0.7
2022	1