Year	2011 PPP (%)
1984	69.5
1987	69.3
1990	63.2
1993	63
1996	57.4
1998	66.8
1999	56.3
2000	55.9
2001	54
2002	45.9
2003	45
2004	45.5
2005	43.8
2006	47.1
2007	42.5
2008	42
2009	40.3
2010	36
2011	33.8
2012	32.8
2013	30.9
2014	29.1
2015	27
2016	24.8
2017	22.7