56% (1974)

69% (1970)

60% (1961)

57% (1970)

61% (1974)

60% (1968)

55% (1980)

65% (1962)

62% (1978)

63% (1970)

66% (1968)

52% (1992)

65% (1979)

67% (1970)

49% (1970)

20% (1992)

36% (1976)

54% (1973)

59% (1976)

69% (1991)