65% (1974)

47% (1968)

67% (1968)

54% (1977)

63% (1964)

56% (1975)

37% (1970)

71% (1965)

62% (1964)

42% (1958)

64% (1969)

54% (1961)

51% (1970)

64% (1977)

56% (1972)

60% (1966)

66% (1969)

50% (1962)

62% (1966)

64% (1976)