69% (1973)

72% (1972)

61% (1967)

63% (1966)

75% (1973)

49% (1965)

63% (1968)

59% (1969)

51% (1966)

63% (1969)

45% (1971)

51% (1968)

56% (1965)

75% (1968)

60% (1966)

43% (1968)

54% (1964)

50% (1967)

57% (1964)

60% (1967)