60% (1972)

69% (1972)

63% (1971)

65% (1965)

63% (1973)

51% (1976)

65% (1974)

57% (1974)

54% (1977)

43% (1966)

61% (1966)

61% (1967)

70% (1971)

57% (1965)

60% (1965)

61% (1973)

58% (1967)

60% (1981)

53% (1970)

54% (1974)