75% (1968)

80% (1966)

80% (1969)

70% (1968)

70% (1971)

57% (1970)

56% (1968)

73% (1970)

77% (1970)

53% (1967)

67% (1968)

71% (1971)

74% (1965)

65% (1968)

62% (1968)

65% (1971)

64% (1971)

62% (1974)

71% (1968)

66% (1965)