Year	2017 PPP (%)
1995	31.6
1996	30.6
1997	30
1998	29.2
1999	28.4
2000	28.2
2001	27.5
2002	27.6
2003	26.4
2004	24.5
2005	23.4
2006	22.4
2007	21.4
2008	20.1
2009	20.4
2010	19.1
2011	18.3
2012	17.5
2013	17.1
2014	16.8
2015	17.3
2016	17.5
2017	17.7