Year	$ 2017 PPP (%)
1997	0.39
2002	0.03
2003	0.23
2004	0.02
2005	0.09
2006	0
2007	0
2008	0
2009	0.18
2010	0
2011	0
2012	0
2013	0
2014	0
2015	0
2016	0