Year	2011 PPP (%)
1981	84.6
1984	68.7
1987	64.1
1990	63.9
1993	59.8
1996	52.3
1999	50.1
2002	43
2005	34.5
2008	29.4
2010	24.4
2011	21.6
2012	19.6
2013	15.3
2015	11.7