59% (1974)

68% (1984)

63% (1956)

64% (1986)

67% (1978)

47% (1995)

61% (1957)

61% (1983)

62% (1971)

70% (1957)

53% (1997)

59% (1977)

64% (1958)

50% (1992)

52% (1960)

55% (1975)

58% (1967)

67% (1957)

61% (1971)

62% (1972)