67% (1976)

64% (1980)

70% (1975)

63% (1979)

67% (1987)

60% (1978)

63% (1981)

60% (1977)

67% (1988)

50% (1974)

85% (1985)

60% (1974)

67% (1988)

78% (1976)

67% (1974)

10% (1988)

67% (1986)

63% (1986)

50% (1981)

67% (1981)