40% (1957)

70% (1980)

58% (1991)

70% (1975)

0% (1965)

30% (1969)

61% (1971)

20% (1982)

78% (1983)

62% (1968)

60% (1980)

60% (1963)

70% (1960)

70% (1976)

58% (1987)

68% (1973)

60% (1977)

0% (1988)

60% (1979)

60% (1965)