Year	2017 PPP (% of population)
1963	4.7
1964	4.2
1965	3.7
1966	4
1967	3.2
1968	2.7
1969	2.5
1970	3
1971	2.5
1972	2.5
1973	2.2
1974	2.5
1975	2.5
1976	2
1977	2
1978	2.2
1979	1.5
1980	1.5
1981	1.5
1982	2
1983	2
1984	1.7
1985	1.7
1986	1.7
1987	1.5
1988	1.5
1989	1.2
1990	1.5
1991	1.5
1992	1.7
1993	1.7
1994	1.7
1995	1.5
1996	1.5
1997	1.5
1998	1.5
1999	1.5
2000	1.5
2001	1.7
2002	1.7
2003	2
2004	2
2005	1.7
2006	2
2007	1.7
2008	2
2009	1.7
2010	2
2011	2
2012	2
2013	2
2014	2
2015	2.2
2016	2
2017	2
2018	1.7
2019	1.7
2020	1.2
2021	1