71% (1977)

42% (1973)

58% (1973)

34% (1960)

25% (1972)

58% (1979)

57% (1971)

48% (1972)

55% (1973)

44% (1980)

50% (1969)

47% (1972)

60% (1966)

45% (1975)

54% (1970)

50% (1981)

50% (1977)

46% (1974)

50% (1959)

50% (1981)