Year	2017 PPP (%)
1971	3
1973	2.1
1975	1.8
1977	1.7
1979	1.5
1981	1.1
1982	0.9
1984	1.1
1985	0.9
1986	1.1
1987	0.7
1988	0.8
1989	1.3
1990	1.3
1991	1.4
1992	0.9
1993	1.3
1994	1
1995	0.9
1996	0.5
1997	0.5
1998	0.6
1999	0.6
2000	0.4
2001	0.4
2002	0.4
2003	0.4
2004	0.4
2005	0.4
2006	0.4
2007	0.3
2008	0.4
2009	0.3
2010	0.3
2011	0.3
2012	0.4
2013	0.5
2014	0.4
2015	0.5
2016	0.4
2017	0.4
2018	0.4
2019	0.4