Year	2011 PPP (% of population)
1996	5.5
1997	16.3
1998	14.6
1999	18.7
2000	19.4
2001	19.4
2002	10.5
2003	10.7
2004	10.1
2005	10.9
2006	10.5
2007	11.8
2008	10.4
2009	10.3
2010	12.2
2011	11.3
2012	8.6
2013	6.6
2014	5
2015	3.8
2016	3.9
2017	5