Year	2011 PPP (%)
1992	9
1996	15.2
1999	17.9
2000	16
2001	17.4
2002	12.2
2003	10.5
2004	9.7
2005	8.6
2008	9.1
2009	8
2010	6.9
2011	5.9
2012	5.7
2013	5.3
2014	4.8
2015	4.3
2016	4.3
2017	3.8