78% (1976)

80% (1967)

78% (1973)

54% (1962)

46% (1962)

57% (1974)

54% (1962)

48% (1967)

47% (1966)

44% (1965)

51% (1966)

75% (1978)

55% (1975)

71% (1969)

50% (1968)

40% (1974)

45% (1962)

69% (1973)

50% (1992)

62% (1964)