82% (1986)

70% (1979)

81% (1979)

72% (1976)

67% (1976)

60% (1974)

63% (1979)

60% (1979)

67% (1981)

70% (1975)

62% (1982)

50% (1974)

10% (1988)

53% (1981)

60% (1977)

60% (1979)

80% (1982)

48% (1988)

77% (1982)

60% (1980)