Year	2011 PPP (%)
1987	27
1994	29.3
1998	29.3
1999	33
2000	39.5
2003	25.1
2004	26
2005	21.3
2006	17.2
2007	16.9
2008	15.8
2009	15.4
2010	13.2
2011	11.3
2012	10.5
2013	9.4
2014	8.2
2015	8.8
2016	8.7
2017	8.2