57% (1986)

68% (1986)

69% (1985)

66% (1988)

73% (1987)

68% (1980)

69% (1985)

61% (1986)

66% (1990)

66% (1987)

77% (1986)

60% (1982)

70% (1984)

63% (1989)

63% (1992)

30% (1986)

59% (1984)

68% (1990)

59% (1990)

55% (1991)