Year	2017 PPP (%)
1995	49.1
1996	48.2
1997	47.6
1998	47
1999	46.4
2000	46.1
2001	45.2
2002	45.5
2003	44.5
2004	42
2005	40.6
2006	39.8
2007	38.9
2008	37.5
2009	37.7
2010	36.3
2011	35.6
2012	34.9
2013	34.4
2014	34.1
2015	34.9
2016	35
2017	34.8