71% (1988)

68% (1985)

61% (1986)

73% (1987)

68% (1985)

66% (1980)

65% (1986)

69% (1987)

60% (1986)

63% (1992)

77% (1986)

51% (1991)

61% (1990)

65% (1990)

64% (1988)

70% (1987)

58% (1982)

75% (1985)

64% (1987)

30% (1986)