59% (1967)

62% (1959)

62% (1979)

54% (1977)

55% (1972)

52% (1988)

56% (1979)

32% (1988)

38% (1991)

57% (1960)

43% (1978)

60% (1976)

64% (1983)

48% (1967)

38% (1991)

49% (1954)

62% (1955)

71% (1974)

62% (1972)

50% (1937)