Year	2017 PPP (% of population)
1997	30
1998	36
1999	48.1
2000	42.6
2001	35.8
2002	30.7
2003	28.9
2004	25.6
2005	22
2006	18.4
2007	13.7
2008	9.4
2009	9
2010	7.2
2011	6.2
2012	5.6
2013	5
2014	4.7
2015	5.5
2016	5.6
2017	5.3
2018	4.9
2019	4.2
2020	4.1