50% (1984)

72% (1987)

70% (1984)

75% (1980)

60% (1988)

63% (1984)

67% (1980)

62% (1983)

63% (1974)

73% (1984)

50% (1979)

67% (1983)

60% (1988)

48% (1979)

70% (1982)

73% (1983)

60% (1989)

48% (1982)

37% (1979)

62% (1980)