47% (1972)

58% (1973)

48% (1972)

54% (1970)

58% (1971)

55% (1973)

50% (1981)

71% (1977)

48% (1980)

42% (1973)

50% (1981)

50% (1959)

46% (1974)

58% (1979)

50% (1977)

55% (1969)

43% (1974)

34% (1960)

43% (1953)

47% (1973)