Year	2017 PPP (%)
1983	0.4
1987	0.2
1990	0.6
1993	0.7
1999	0.2
2004	0.1
2005	0.1
2006	0
2007	0
2008	0.1
2009	0.1
2010	0
2011	0.1
2012	0
2013	0
2014	0
2015	0
2016	0
2017	0.1
2018	0.1
2019	0
2020	0
2021	0