Year	2017 PPP (%)
1997	34.9
1998	44.4
1999	52
2000	51.6
2001	45.5
2002	35.3
2003	27.5
2004	28.2
2005	33.3
2006	13.4
2007	9.6
2008	10
2009	9.5
2010	7.8
2011	6.4
2012	5.9
2013	4.4
2014	3.8
2015	3.3
2016	3.3
2017	3.3
2018	2.6
2019	2.6
2021	2.5