Year	2011 PPP (%)
1989	27
1991	31
1995	23.1
1996	24.3
1998	28
1999	24.9
2000	20.5
2001	21.8
2002	22.1
2003	23.1
2004	19.7
2005	19.5
2006	16.6
2007	14
2008	16.9
2009	16.2
2010	15.7
2011	14.9
2012	13.5
2013	12
2014	11.7
2015	10
2016	10.1
2017	8.8