Year	2011 PPP (%)
1984	27.5
1987	25.8
1990	18
1993	17.8
1996	13
1998	22.4
1999	10.1
2000	9.1
2001	7.7
2002	4.2
2003	4.3
2004	5.2
2005	4.3
2006	6.3
2007	4.7
2008	4.4
2009	3.5
2010	2.9
2011	2.3
2012	1.9
2013	1.4
2014	1.2
2015	1.2
2016	1
2017	0.9