65% (1982)

70% (1986)

65% (1984)

48% (1979)

70% (1984)

63% (1984)

73% (1978)

60% (1988)

60% (1989)

70% (1979)

60% (1988)

50% (1984)

80% (1987)

62% (1980)

70% (1981)

72% (1978)

67% (1989)

40% (1987)

60% (1977)

67% (1984)