54% (1974)

70% (1984)

53% (1977)

70% (1974)

65% (1971)

60% (1980)

61% (1973)

30% (1988)

60% (1976)

62% (1973)

71% (1976)

45% (1985)

48% (1980)

63% (1972)

60% (1980)

0% (1986)

75% (1984)

67% (1973)

60% (1975)

60% (1985)