67% (1983)

68% (1972)

66% (1973)

50% (1977)

67% (1973)

64% (1974)

63% (1972)

60% (1973)

59% (1971)

62% (1979)

57% (1980)

60% (1972)

53% (1977)

48% (1980)

61% (1973)

30% (1984)

69% (1975)

63% (1975)

75% (1984)

0% (1982)