Year	2017 PPP (%)
1990	15.4
1992	25.1
1997	24
1999	29.3
2000	32.7
2001	27.6
2002	29.1
2004	20.6
2005	24
2006	21
2007	18.9
2008	15.1
2009	13.5
2011	10.2
2012	10.9
2013	9.4
2014	8.7
2015	8.8
2016	9.8
2017	9.1
2018	7.8
2019	5.8
2020	6.6
2021	5.4