57% (1976)

72% (1989)

50% (1978)

41% (1978)

48% (1980)

54% (1972)

38% (1977)

42% (1975)

45% (1983)

53% (1971)

62% (1970)

50% (1962)

50% (1973)

42% (1980)

50% (1973)

50% (1973)

46% (1983)

63% (1969)

50% (1975)

50% (1997)