63% (1979)

66% (1964)

52% (1977)

66% (1963)

55% (1963)

30% (1969)

51% (1979)

59% (1973)

59% (1976)

68% (1973)

62% (1978)

63% (1974)

57% (1974)

54% (1977)

66% (1973)

56% (1977)

63% (1963)

69% (1975)

49% (1977)

44% (1976)