61% (1974)

63% (1973)

42% (1971)

73% (1967)

57% (1968)

58% (1976)

57% (1969)

58% (1976)

55% (1968)

36% (1974)

50% (1977)

50% (1972)

52% (1969)

70% (1968)

54% (1968)

44% (1967)

58% (1967)

50% (1975)

59% (1967)

50% (1968)