68% (1983)

48% (1980)

60% (1972)

69% (1972)

50% (1977)

66% (1973)

63% (1972)

62% (1979)

57% (1980)

53% (1977)

62% (1973)

67% (1973)

64% (1973)

73% (1982)

62% (1983)

67% (1973)

10% (1978)

42% (1978)

47% (1979)

45% (1985)