Year	2017 PPP (%)
1993	23.3
1994	23.9
1995	24
1996	23.5
1997	23
1998	22.4
1999	21.8
2001	20
2002	19.4
2003	18.5
2004	17
2005	16.1
2006	15.2
2007	14
2008	13.2
2009	13
2010	11.9
2011	11.4
2012	11
2013	10.6
2014	10.4
2015	10.9
2016	11.2
2017	11.3
2018	11.3