45% (1971)

54% (1975)

50% (1974)

55% (1974)

56% (1971)

36% (1975)

54% (1967)

20% (1975)

54% (1970)

39% (1974)

46% (1973)

52% (1973)

20% (1972)

45% (1964)

64% (1975)

40% (1970)

10% (1973)

30% (1969)

40% (1971)

10% (1976)