69% (1971)

51% (1976)

57% (1965)

64% (1965)

62% (1966)

60% (1972)

57% (1974)

60% (1967)

69% (1972)

54% (1977)

53% (1970)

59% (1973)

63% (1973)

59% (1981)

65% (1974)

62% (1974)

59% (1965)

51% (1967)

63% (1971)

55% (1971)