80% (1986)

75% (1986)

67% (1985)

68% (1984)

72% (1986)

71% (1982)

71% (1985)

63% (1985)

67% (1985)

69% (1985)

68% (1982)

67% (1985)

61% (1981)

55% (1985)

71% (1981)

60% (1985)

55% (1982)

64% (1982)

58% (1985)