61% (1989)

59% (1990)

58% (1989)

52% (1989)

65% (1978)

46% (1985)

51% (1987)

50% (1984)

47% (1985)

62% (1988)

50% (1988)

45% (1988)

36% (1986)

36% (1987)

49% (1989)

52% (1988)

60% (1985)

45% (1988)

51% (1989)

51% (1989)