46% (1987)

62% (1986)

65% (1987)

57% (1986)

62% (1985)

60% (1986)

57% (1989)

70% (1985)

58% (1987)

57% (1987)

59% (1984)

60% (1985)

48% (1986)

63% (1982)

55% (1987)

53% (1986)

54% (1981)

60% (1981)

63% (1985)

58% (1985)