Year	2017 PPP (% of population)
1989	54.2
1990	54.5
1991	53.5
1992	52.2
1993	52.5
1994	51.2
1995	50.7
1996	49.2
1997	48.5
1998	48.6
1999	48.7
2000	48.4
2001	47.6
2002	46.8
2003	44.8
2004	41.3
2005	39.2
2006	37.5
2007	35.4
2008	33.6
2009	32.6
2010	31.2
2011	30.2
2012	29.3
2013	28.5
2014	27.8
2015	27.9
2016	27.7
2017	27
2018	26.4
2019	26.2