85% (1984)

81% (1981)

62% (1983)

74% (1981)

62% (1986)

61% (1983)

66% (1986)

70% (1986)

67% (1983)

66% (1984)

55% (1986)

65% (1982)

52% (1986)

67% (1984)

56% (1984)