42% (1981)

72% (1986)

55% (1985)

55% (1984)

54% (1980)

51% (1990)

46% (1982)

51% (1985)

59% (1985)

59% (1985)

29% (1988)

64% (1986)

48% (1986)

46% (1989)

41% (1993)

50% (1987)

61% (1988)

54% (1993)

46% (1987)

63% (1987)