Year	2011 PPP (%)
1989	49.2
1990	51.3
1991	44.4
1992	40.9
1993	35.8
1994	37
1995	38
1996	40.6
1997	32.1
1998	35.1
1999	35.9
2001	29
2002	32.4
2003	36.3
2004	35.4
2005	34.3
2006	30.2
2007	26.2
2008	24.8
2009	22.2
2010	23.9
2011	26.1
2012	29.2
2013	27
2014	25.8
2015	26.1
2016	24.6
2017	25.9