Year	2017 PPP (% of population)
1986	53
1990	55.4
1994	47.7
1998	44.8
2005	23.5
2006	24.7
2009	22.7
2011	20.9
2012	19.7
2013	20.9
2014	23.5
2015	23
2016	23.1
2017	21.6
2018	24.4
2019	29.1
2020	29.3
2021	24.8
2022	21.9