67% (1984)

70% (1977)

57% (1976)

67% (1972)

75% (1980)

64% (1983)

70% (1975)

64% (1974)

59% (1982)

57% (1976)

20% (1973)

60% (1975)

57% (1986)

83% (1977)

82% (1976)

45% (1979)

63% (1982)

73% (1983)

57% (1974)

45% (1985)