Year	$ 2017 PPP (%)
1999	3.3
2001	2.93
2002	2.55
2003	1.93
2004	1.38
2005	0.76
2006	0.44
2007	0.36
2008	0.14
2009	0.22
2010	0.37
2011	0.75
2012	0.41
2013	0.79
2014	0.43
2015	0.36
2016	0.64
2017	0.7
2019	0.9
2020	5.74
2021	0.38