Year	2011 PPP (%)
1997	14.7
1998	14
1999	14.4
2000	13.1
2001	14
2002	12.3
2003	10.4
2004	11.3
2005	12.5
2006	10.8
2007	9.1
2008	7.4
2009	6.2
2010	5
2011	4.6
2012	4.3
2013	3.8
2014	3.4
2015	3.4
2016	3.2
2017	3.2