Year	2017 PPP (%)
1968	0.3
1969	0.4
1970	0.3
1971	0.3
1972	0.5
1973	0.1
1974	0.3
1975	0.3
1976	0.2
1977	0.3
1978	0.1
1979	0.2
1980	0.2
1981	0.3
1982	0.2
1983	0.2
1984	0.2
1985	0.2
1986	0.3
1987	0.2
1988	0.2
1989	0.3
1990	0.3
1991	0.2
1992	0.3
1993	0.3
1994	0.5
1995	0.4
1996	0.3
1997	0.3
1998	0.4
1999	0.3
2000	0.3
2001	0.4
2002	0.4
2003	0.4
2004	0.3
2005	0.4
2006	0.4
2007	0.4
2008	0.4
2009	0.4
2010	0.4
2011	0.4
2012	0.5
2013	0.3
2014	0.4
2015	0.4
2016	0.4
2017	0.4
2018	0.5
2019	0.5
2020	0.6
2021	0.4