Year	2011 PPP (%)
1989	32.9
1990	34.7
1991	26.4
1992	23
1993	19.7
1994	21.2
1995	22.2
1996	24.9
1997	17.2
1998	21.8
1999	21.9
2001	17
2002	19
2003	22.5
2004	21.8
2005	21.6
2006	18.4
2007	13.9
2008	13.5
2009	11.2
2010	12.2
2011	14.1
2012	16.2
2013	14.2
2014	13.1
2015	13.3
2016	13.1
2017	14