57% (1986)

57% (1985)

63% (1981)

80% (1989)

56% (1992)

59% (1984)

63% (1991)

67% (1982)

66% (1985)

58% (1988)

60% (1986)

37% (1987)

41% (1984)

63% (1982)

61% (1986)

54% (1985)

53% (1983)

64% (1987)

58% (1983)

53% (1986)