57% (1986)

66% (1988)

69% (1985)

68% (1980)

77% (1986)

68% (1986)

66% (1987)

73% (1987)

69% (1985)

61% (1986)

63% (1992)

65% (1990)

71% (1984)

60% (1982)

55% (1991)

62% (1989)

30% (1986)

59% (1990)

75% (1985)

62% (1984)