Year	2017 PPP (%)
1990	72.8
1993	68.6
1996	61.1
1999	58.5
2002	51
2005	40.8
2008	34.3
2010	29.3
2011	25.9
2012	22.9
2013	17.1
2014	14.5
2015	12.2
2016	10.5
2017	9.7
2018	8
2019	6.4
2020	5.9