38% (1957)

40% (1965)

47% (1958)

50% (1957)

45% (1994)

50% (1959)

50% (1957)

50% (1964)

64% (1961)

25% (1963)

30% (1963)

55% (1967)

51% (1969)

50% (1967)

58% (1971)

44% (1969)

40% (1958)

42% (1959)

45% (1968)

56% (1971)