Year	2011 PPP (%)
1998	31.9
1999	28.9
2000	24.2
2001	15.5
2002	12.3
2003	10.6
2004	6.3
2005	3.8
2006	2.3
2007	1.6
2008	1.1
2009	1
2010	0.6
2011	0.4
2012	0.2
2013	0.1
2014	0.1
2015	0.1
2016	0.1
2017	0.1