Year	$ 2017 PPP (%)
1998	3.54
1999	5.01
2000	5.25
2001	4.74
2002	3.19
2003	1.93
2004	1
2005	2.5
2006	1.19
2007	0.49
2008	0.19
2009	0.3
2010	0.17
2011	0.04
2012	0.13
2013	0.03
2014	0.01
2015	0
2016	0
2017	0
2018	0.01
2019	0.14
2020	0
2021	0.09