66% (1981)

71% (1979)

44% (1983)

48% (1984)

62% (1983)

60% (1985)

63% (1980)

62% (1980)

66% (1990)

59% (1984)

60% (1987)

58% (1983)

63% (1985)

55% (1986)

47% (1984)

66% (1981)

53% (1985)

63% (1977)

52% (1982)

59% (1982)