Year	2017 PPP (% of population)
1989	40
1990	42
1991	30.8
1992	27
1993	21.4
1994	24.3
1995	26.2
1996	28.6
1997	19.6
1998	24.5
1999	24.9
2001	19.8
2002	22
2003	26.5
2004	25.4
2005	25.1
2006	21.1
2007	15.6
2008	15.2
2009	12.3
2010	13.8
2011	14.3
2012	17
2013	14.6
2014	13.3
2015	13
2016	14.6
2017	13.9
2018	14.2
2019	12.7