74% (1976)

54% (1968)

70% (1984)

62% (1991)

73% (1960)

70% (1971)

56% (1979)

60% (1963)

72% (1971)

56% (1973)

0% (1972)

0% (1973)

20% (1975)

71% (1958)

0% (1986)

58% (1978)

78% (1982)

0% (1984)

45% (1966)

68% (1972)