56% (1974)

56% (1975)

60% (1961)

52% (1992)

67% (1975)

57% (1970)

63% (1977)

54% (1973)

68% (1970)

61% (1974)

50% (1975)

60% (1968)

55% (1980)

65% (1962)

62% (1978)

69% (1991)

56% (1970)

35% (1979)

43% (1969)

44% (1975)