48% (1981)

50% (1981)

50% (1977)

62% (1972)

54% (1971)

30% (1976)

45% (1979)

57% (1973)

42% (1977)

63% (1976)

49% (1974)

0% (1975)

30% (1980)

0% (1984)

41% (1977)