68% (1973)

71% (1970)

59% (1972)

58% (1984)

72% (1971)

61% (1972)

49% (1969)

65% (1968)

47% (1970)

72% (1972)

60% (1969)

54% (1973)

37% (1969)

64% (1971)

42% (1968)

64% (1973)

46% (1969)