50% (1969)

61% (1974)

42% (1971)

63% (1973)

54% (1967)

58% (1976)

50% (1972)

54% (1968)

58% (1976)

62% (1969)

55% (1968)

70% (1991)

50% (1973)

50% (1974)

73% (1967)

50% (1967)

57% (1968)

63% (1968)

0% (1974)

52% (1969)