57% (1968)

58% (1976)

68% (1989)

67% (1969)

63% (1969)

56% (1969)

52% (1977)

46% (1988)

58% (1976)

0% (1972)

0% (1937)

61% (1978)

59% (1987)

62% (1932)

62% (1965)

61% (1986)

65% (1976)

68% (1984)

80% (1978)

50% (1955)