Year	2017 PPP (%)
1981	18.3
1988	15.2
1990	12.8
1992	10.1
1994	6.1
1996	4.6
1998	4.1
1999	5.7
2000	5.7
2002	3.5
2004	2.5
2006	1.8
2007	1.2
2008	0.9
2009	0.8
2010	0.6
2011	0.3
2012	0.4
2013	0.3
2014	0.2
2015	0.1
2016	0.1
2017	0.1
2018	0.1
2019	0.1
2020	0.1
2021	0.1