67% (1981)

71% (1979)

63% (1980)

77% (1979)

63% (1981)

78% (1980)

73% (1982)

51% (1990)

53% (1981)

50% (1984)

65% (1981)

54% (1979)

44% (1981)

49% (1981)

76% (1980)

62% (1990)

41% (1984)

64% (1975)

63% (1981)

70% (1988)