69% (1967)

67% (1968)

64% (1968)

65% (1964)

70% (1967)

65% (1964)

64% (1969)

62% (1963)

63% (1965)

56% (1964)

64% (1966)

57% (1967)

62% (1966)

70% (1966)

70% (1965)

60% (1964)

54% (1967)

48% (1967)

49% (1969)

35% (1964)