69% (1973)

72% (1971)

59% (1972)

61% (1972)

71% (1970)

57% (1984)

64% (1973)

65% (1971)

50% (1969)

37% (1969)

72% (1972)

54% (1973)

65% (1968)

47% (1970)

60% (1969)

42% (1968)

46% (1969)