53% (1976)

70% (1979)

69% (1963)

45% (1990)

71% (1962)

67% (1964)

58% (1971)

60% (1971)

61% (1966)

63% (1965)

66% (1972)

52% (1988)

53% (1985)

69% (1965)

63% (1964)

60% (1970)

65% (1968)

62% (1965)

52% (1970)

47% (1995)