59% (1958)

62% (1963)

56% (1964)

64% (1965)

61% (1963)

54% (1957)

50% (1959)

54% (1958)

31% (1962)

50% (1960)

54% (1958)

50% (1961)

55% (1960)

60% (1958)

50% (1957)

67% (1960)

42% (1962)

55% (1961)

51% (1958)

50% (1959)