57% (1988)

56% (1974)

58% (1986)

68% (1985)

58% (1979)

59% (1987)

45% (1985)

52% (1987)

46% (1972)

60% (1974)

48% (1974)

52% (1985)

57% (1975)

56% (1986)

55% (1976)

55% (1988)

55% (1983)

42% (1978)

57% (1976)

53% (1977)