Year	2017 PPP (%)
1993	55.9
1994	57
1995	57.3
1996	57.2
1997	56.7
1998	56.1
1999	57
2001	54.3
2002	54.1
2003	53.9
2004	51.6
2005	50.2
2006	49.2
2007	48.2
2008	47.4
2009	47.1
2010	46
2011	45.7
2012	45.4
2013	45
2014	44.7
2015	46.2
2016	46.3
2017	46.1
2018	45.9