64% (1973)

61% (1974)

64% (1977)

56% (1969)

50% (1974)

63% (1968)

42% (1971)

54% (1967)

44% (1967)

73% (1967)

63% (1976)

47% (1974)

58% (1967)

50% (1969)

50% (1977)

59% (1967)

56% (1976)

58% (1976)

0% (1974)

57% (1968)