78% (1976)

62% (1964)

79% (1973)

45% (1969)

57% (1974)

67% (1977)

81% (1967)

40% (1974)

70% (1969)

50% (1958)

50% (1992)

53% (1968)

67% (1970)

53% (1963)

64% (1967)

49% (1968)

69% (1973)

55% (1968)

62% (1975)

40% (1975)