Year	2017 PPP (% of population)
1998	21.8
1999	19.2
2000	13.6
2001	6.6
2002	4.4
2003	3.5
2004	1.3
2005	0.9
2006	0.4
2007	0.2
2008	0.2
2009	0.1
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0