Year	2011 PPP (%)
1996	15
1997	29.8
1998	28.9
1999	33.8
2000	35.5
2001	36.9
2002	25.8
2003	25.9
2004	24.2
2005	25.6
2006	26
2007	27.3
2008	24.8
2009	24.9
2010	26
2011	24.8
2012	22
2013	18.8
2014	16.5
2015	15.5
2016	15.1
2017	15.5