47% (1988)

70% (1986)

51% (1984)

62% (1983)

42% (1986)

47% (1982)

52% (1987)

56% (1988)

40% (1988)

42% (1987)

47% (1991)

60% (1987)

62% (1987)

45% (1988)

47% (1982)

60% (1985)

60% (1980)

41% (1986)

55% (1984)

54% (1987)