Year	2011 PPP (%)
1999	16.9
2001	18
2002	15.7
2003	13.2
2004	9.6
2005	6.1
2006	4.9
2007	4.1
2008	2.7
2009	3.9
2010	4
2011	3.8
2012	3.4
2013	3.5
2014	3.5
2015	3
2016	2.9
2017	2.5