52% (1977)

50% (1978)

48% (1966)

56% (1973)

52% (1992)

50% (1964)

53% (1965)

60% (1968)

65% (1966)

52% (1968)

50% (1962)

50% (1960)

71% (1960)

46% (1993)

56% (1963)

61% (1981)

50% (1988)

69% (1968)

61% (1965)

50% (1961)