56% (1974)

60% (1961)

57% (1970)

61% (1974)

61% (1968)

63% (1978)

69% (1970)

51% (1992)

65% (1962)

50% (1975)

69% (1991)

43% (1974)

60% (1972)

54% (1973)

55% (1980)

48% (1970)

52% (1970)

63% (1970)

66% (1968)

67% (1975)