Year	$ 2017 PPP (%)
2002	11.03
2003	6.31
2004	4.87
2005	1.78
2006	1.36
2007	0.84
2008	0.46
2009	0.76
2010	0.27
2011	0.34
2012	0.33
2013	0.24
2014	0.18
2015	0.59
2016	0.54
2017	0.49
2018	0.43
2019	0.23