Year	2017 PPP (% of population)
1989	60
1990	62.3
1991	54.4
1992	50
1993	43.4
1994	43.7
1995	46.1
1996	48.9
1997	38.1
1998	40.2
1999	41.5
2001	34
2002	38
2003	43.3
2004	42
2005	39.8
2006	35.1
2007	30.2
2008	28.9
2009	25.7
2010	27.8
2011	28.1
2012	32.8
2013	29.2
2014	28.8
2015	28.6
2016	28.3
2017	27.5
2018	27.2
2019	26.4