Year	2017 PPP (%)
1997	12.9
1998	20.6
1999	27.5
2000	25.7
2001	20.5
2002	12.8
2003	7.1
2004	7.9
2005	11.1
2006	2.5
2007	1.4
2008	1.6
2009	1.3
2010	0.8
2011	0.5
2012	0.4
2013	0.2
2014	0.1
2015	0.1
2016	0.2
2017	0.1
2018	0.1
2019	0.1
2021	0.1