66% (1988)

69% (1985)

57% (1986)

73% (1987)

69% (1985)

68% (1980)

63% (1990)

77% (1986)

68% (1986)

61% (1982)

40% (1989)

70% (1984)

66% (1987)

63% (1992)

61% (1986)

30% (1986)

55% (1991)

75% (1985)

70% (1987)

63% (1989)