Year 2017 PPP (%) 1963 2.2 1964 2.1 1965 1.8 1966 1.8 1967 1.5 1968 1.3 1969 1 1970 1.5 1971 1.2 1972 1.2 1973 1.1 1974 1.2 1975 1.1 1976 0.9 1977 0.9 1978 0.9 1979 0.8 1980 0.7 1981 0.8 1982 1 1983 1 1984 0.8 1985 0.8 1986 0.8 1987 0.8 1988 0.7 1989 0.6 1990 0.7 1991 0.8 1992 0.8 1993 0.8 1994 0.9 1995 0.8 1996 0.8 1997 0.9 1998 1 1999 0.8 2000 0.9 2001 1.1 2002 1 2003 1.2 2004 1.2 2005 1.2 2006 1.2 2007 1.2 2008 1.2 2009 1.1 2010 1.3 2011 1.3 2012 1.2 2013 1.2 2014 1.4 2015 1.4 2016 1.3 2017 1.4 2018 1.2 2019 1.1 2020 0.6 2021 0.5