Year	2011 PPP (%)
1981	15.5
1988	12.4
1990	10.2
1992	7.9
1994	4.5
1996	3.3
1998	2.9
1999	4.1
2000	4.1
2002	2.4
2004	1.7
2006	1.2
2007	0.7
2008	0.5
2009	0.5
2010	0.4
2011	0.2
2012	0.2
2013	0.1
2014	0.1
2015	0.1
2016	0.1
2017	0.1