Year	2011 PPP (%)
1984	25.9
1987	25.1
1990	22.7
1993	24.2
1996	23.8
1999	19.4
2002	18.4
2005	17.4
2008	15.9
2010	13.9
2011	13.6
2012	13.4
2013	13.3
2015	14.8