78% (1967)

64% (1967)

72% (1971)

72% (1970)

53% (1967)

51% (1975)

59% (1976)

72% (1970)

61% (1968)

53% (1966)

43% (1965)

57% (1967)

58% (1966)

61% (1968)

54% (1969)

68% (1968)

57% (1964)

63% (1969)

64% (1966)

65% (1965)