65% (1978)

60% (1990)

58% (1989)

49% (1989)

61% (1989)

47% (1985)

52% (1989)

51% (1988)

51% (1987)

47% (1987)

45% (1988)

47% (1985)

51% (1989)

60% (1985)

50% (1984)

62% (1988)

32% (1987)

36% (1986)

46% (1983)

52% (1988)