53% (1986)

58% (1985)

47% (1986)

68% (1987)

56% (1985)

54% (1981)

56% (1986)

60% (1982)

60% (1988)

56% (1986)

62% (1983)

54% (1983)

33% (1984)

62% (1988)

55% (1987)

40% (1984)

60% (1981)

58% (1985)

66% (1984)

55% (1987)