59% (1971)

67% (1983)

69% (1972)

60% (1973)

50% (1977)

67% (1973)

62% (1979)

66% (1973)

59% (1976)

63% (1975)

53% (1977)

57% (1980)

60% (1972)

63% (1972)

50% (1986)

69% (1975)

62% (1980)

48% (1980)

62% (1984)

50% (1977)