48% (1981)

42% (1973)

55% (1973)

44% (1972)

53% (1970)

57% (1971)

72% (1977)

44% (1975)

46% (1972)

52% (1973)

45% (1980)

50% (1977)

45% (1974)

50% (1959)

44% (1971)

50% (1981)

43% (1973)

55% (1976)

42% (1974)

51% (1969)