78% (1967)

47% (1964)

59% (1976)

72% (1971)

63% (1969)

58% (1966)

52% (1967)

63% (1966)

57% (1967)

51% (1975)

63% (1967)

64% (1965)

71% (1970)

45% (1970)

44% (1971)

53% (1966)

53% (1967)

54% (1969)

61% (1968)

43% (1965)