Year	2011 PPP (%)
1987	13.5
1994	13.7
2002	11.9
2003	13.7
2004	9.6
2005	9
2006	7.6
2007	6.5
2008	5.4
2009	5
2010	4.8
2011	4.1
2012	3.7
2013	3.2
2014	2.9
2015	3.1
2016	2.5