59% (1990)

61% (1989)

58% (1989)

47% (1985)

64% (1978)

56% (1987)

51% (1989)

51% (1989)

51% (1987)

46% (1988)

61% (1985)

42% (1988)

50% (1984)

51% (1989)

36% (1986)

34% (1987)

49% (1988)

52% (1988)

45% (1988)

43% (1987)