64% (1987)

70% (1988)

69% (1989)

69% (1987)

56% (1986)

63% (1986)

46% (1987)

63% (1985)

62% (1986)

54% (1990)

59% (1986)

57% (1987)

55% (1987)

66% (1982)

48% (1984)

59% (1984)

62% (1990)

70% (1985)

61% (1988)

53% (1986)