85% (1984)

62% (1986)

75% (1981)

81% (1981)

62% (1983)

61% (1983)

70% (1986)

67% (1986)

67% (1983)

64% (1982)

66% (1984)

55% (1986)

52% (1986)

58% (1984)

67% (1984)