85% (1984)

61% (1986)

74% (1981)

81% (1981)

70% (1986)

60% (1983)

62% (1983)

67% (1986)

67% (1983)

55% (1986)

52% (1986)

65% (1984)

65% (1982)

56% (1984)

67% (1984)